diff --git a/README.md b/README.md
index ac966be..814bd87 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@
 
 #### Definition description
 
-Definitions have procedural representation aiming to explain behaviors. Each definition is general. It can be a word or a phrase that represent a broad category or concept rather than a specific instance or entity. For instance, *car*, *list*, *human*, *country* represent *general terms*. *My car*, *your todo list*, *Albert Einstein*, *Poland* are singular instances of these general terms or so called *singular terms*[6]. *DefinIT* does not examine *singular terms*. In an analogy to object oriented programming, *DefinIT* examine definitions or classes, but not instances.
+Definition can be a word or a phrase that represent a broad category, concept, or a specific instance/entity. For instance, *car*, *list*, *human*, *country* represent *general terms*. *My car*, *your todo list*, *Albert Einstein*, *Poland* are singular instances of these general terms or so called *singular terms*[6]. *DefinIT* mainly focus on *general terms*, but it does not exclude *singular terms*.
 
 #### DefinIT structure
 
@@ -73,7 +73,7 @@ While earlier projects focused on nomenclature within a single field, DefinIT ge
 
 - Learning a new field of knowledge.
 - Deepening understanding of a specific topic/term.
-- Specifying an unambiguous language that experts in a field use to communicate with each other, improving the quality and clarity of communication.
+- Specifying an unambiguous language that experts in a field reference to, improving the quality and clarity of communication.
 - Enhancing training or tuning data, or parts of prompts, for LLM-based systems.
 - Studying all specialized terms and concepts within a specific book (as a pre-reading exercise).
 - Learning all specific terms and concepts within a presentation (to be better prepared for a lecture).
diff --git a/presentation/common/generate_qr_code.py b/presentation/common/generate_qr_code.py
new file mode 100644
index 0000000..03e5f3d
--- /dev/null
+++ b/presentation/common/generate_qr_code.py
@@ -0,0 +1,25 @@
+import sys
+
+import qrcode
+
+is_web_app = sys.argv[1] == "web" if len(sys.argv) > 1 else False
+url_web_app = "https://k4liber.github.io/definit-dsa/"
+url_github_repo = "https://github.com/K4liber/definit"
+url = url_web_app if is_web_app else url_github_repo
+img_name = "web_app_qr_code.png" if is_web_app else "github_repo_qr_code.png"
+
+# Generate the QR code
+qr = qrcode.QRCode(
+    version=1,
+    error_correction=qrcode.constants.ERROR_CORRECT_L,
+    box_size=10,
+    border=4,
+)
+qr.add_data(url)
+qr.make(fit=True)
+
+# Create an image from the QR code
+img = qr.make_image(fill_color="black", back_color="white")
+
+# Save the image (e.g., as a PNG)
+img.save(img_name)
diff --git a/presentation/warsaw_python_pizza/JanBielecki_20260505.pdf b/presentation/warsaw_python_pizza/JanBielecki_20260505.pdf
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diff --git a/presentation/warsaw_python_pizza/img/whats_next.png b/presentation/warsaw_python_pizza/img/whats_next.png
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index 0000000..d1afeec
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diff --git a/presentation/warsaw_python_pizza/img/why.png b/presentation/warsaw_python_pizza/img/why.png
new file mode 100644
index 0000000..e05d810
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diff --git a/presentation/warsaw_python_pizza/img/x.png b/presentation/warsaw_python_pizza/img/x.png
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index 0000000..9c8251b
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diff --git a/presentation/warsaw_python_pizza/slides_scratch.md b/presentation/warsaw_python_pizza/slides_scratch.md
new file mode 100644
index 0000000..51e30cc
--- /dev/null
+++ b/presentation/warsaw_python_pizza/slides_scratch.md
@@ -0,0 +1,86 @@
+# Knowledge representation for efficient learning and communication
+
+- Author: Jan Bielecki
+- Event: Warsaw Python Pizza
+- Date: 20260509
+
+# Gamification of a learning process
+
+- Its fun to create games.
+- Its fulfilling to make something useful.
+- Duolingo as an example of gamification in learning.
+
+# Different learning platforms
+
+- Codecademy
+- Leetcode
+- Brilliant
+- Coursera
+- edX
+- Khan Academy
+- Udacity
+
+- Some of the platforms have a gamification element to enhance the learning experience.
+
+# Let's create the universal platform!
+
+- standards.png
+
+# Basic building block of a knowledge representation
+
+- What is the smallest unit of knowledge that can be checked as "learned" and we can move forward to the next one?
+
+# First principles thinking
+
+- Divide and conquer.
+
+# Definition as the smallest unit of knowledge
+
+- Examples of definitions.
+- Literature overview.
+-- "First Glossary of Programming Terminology"
+-- "IEEE Standard Glossary of Software Engineering Terminology"
+-- UML, Internet, Wikipedia ...
+
+# Definition properties
+
+- Key (definition name, field Why? Two same names can exist in different fields.)
+- Value (content, dependencies: definitions can rely on other definitions)
+
+# Structure of definitions
+
+- DAG.
+
+# Using Python as a platform for creating and managing knowledge representations
+
+- Strict format for definitions
+- Github Copilot helps with the content creation.
+- Tests, visualizations.
+- Serializers.
+
+# POC - Data Structures and Algorithms (DSA)
+
+- https://k4liber.github.io/definit-dsa/
+
+# Why it exists?
+
+- Efficient learning - by breaking down complex topics into smaller, manageable units.
+- DAG structure implies where to start.
+-- from the low-level definitions.
+-- from the set of descendant definitions of a given definition.
+- A living, qualitative and structured glossary for any field of knowledge.
+- Improved quality and clarity of training data for machine learning models.
+
+# What is wrong with such approach?
+
+- A lot of effort to create a qualitative knowledge representation.
+- Who decides a definition content and dependencies?
+- DAG structure is an assumption that all knowledge can be represented in a hierarchical manner.
+- "Brain rot" content is more addictive then a well-structured knowledge representation.
+- "In theory, there is no difference between theory and practice. But in practice, there is."~Benjamin Brewster
+-- The brain learns most effectively through active, deliberate practice, and a static knowledge representation may not provide the necessary engagement and feedback for optimal learning.
+
+# What's next?
+
+- Explore more high-level concepts (uv, compilation, architecture).
+- Creating a more engaging learning experience (questions, active and deliberate practice, tasks).
diff --git a/uv.lock b/uv.lock
index 147ecbe..c5e59b0 100644
--- a/uv.lock
+++ b/uv.lock
@@ -5,7 +5,7 @@ requires-python = ">=3.12"
 [[package]]
 name = "click"
 version = "8.3.1"
-source = { registry = "https://pypi.org/simple/" }
+source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "colorama", marker = "sys_platform == 'win32'" },
 ]
@@ -17,7 +17,7 @@ wheels = [
 [[package]]
 name = "colorama"
 version = "0.4.6"
-source = { registry = "https://pypi.org/simple/" }
+source = { registry = "https://pypi.org/simple" }
 sdist = { url = "https://files.pythonhosted.org/packages/d8/53/6f443c9a4a8358a93a6792e2acffb9d9d5cb0a5cfd8802644b7b1c9a02e4/colorama-0.4.6.tar.gz", hash = "sha256:08695f5cb7ed6e0531a20572697297273c47b8cae5a63ffc6d6ed5c201be6e44", size = 27697, upload-time = "2022-10-25T02:36:22.414Z" }
 wheels = [
     { url = "https://files.pythonhosted.org/packages/d1/d6/3965ed04c63042e047cb6a3e6ed1a63a35087b6a609aa3a15ed8ac56c221/colorama-0.4.6-py2.py3-none-any.whl", hash = "sha256:4f1d9991f5acc0ca119f9d443620b77f9d6b33703e51011c16baf57afb285fc6", size = 25335, upload-time = "2022-10-25T02:36:20.889Z" },
@@ -25,7 +25,7 @@ wheels = [
 
 [[package]]
 name = "definit"
-version = "0.4.1"
+version = "0.6.0"
 source = { virtual = "." }
 
 [package.optional-dependencies]
@@ -52,7 +52,7 @@ dev = [{ name = "pytest" }]
 [[package]]
 name = "grimp"
 version = "3.14"
-source = { registry = "https://pypi.org/simple/" }
+source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "typing-extensions" },
 ]
@@ -121,7 +121,7 @@ wheels = [
 [[package]]
 name = "import-linter"
 version = "2.9"
-source = { registry = "https://pypi.org/simple/" }
+source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "click" },
     { name = "grimp" },
@@ -136,7 +136,7 @@ wheels = [
 [[package]]
 name = "iniconfig"
 version = "2.3.0"
-source = { registry = "https://pypi.org/simple/" }
+source = { registry = "https://pypi.org/simple" }
 sdist = { url = "https://files.pythonhosted.org/packages/72/34/14ca021ce8e5dfedc35312d08ba8bf51fdd999c576889fc2c24cb97f4f10/iniconfig-2.3.0.tar.gz", hash = "sha256:c76315c77db068650d49c5b56314774a7804df16fee4402c1f19d6d15d8c4730", size = 20503, upload-time = "2025-10-18T21:55:43.219Z" }
 wheels = [
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@@ -145,7 +145,7 @@ wheels = [
 [[package]]
 name = "markdown-it-py"
 version = "4.0.0"
-source = { registry = "https://pypi.org/simple/" }
+source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "mdurl" },
 ]
@@ -157,7 +157,7 @@ wheels = [
 [[package]]
 name = "mdurl"
 version = "0.1.2"
-source = { registry = "https://pypi.org/simple/" }
+source = { registry = "https://pypi.org/simple" }
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 wheels = [
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@@ -166,7 +166,7 @@ wheels = [
 [[package]]
 name = "packaging"
 version = "25.0"
-source = { registry = "https://pypi.org/simple/" }
+source = { registry = "https://pypi.org/simple" }
 sdist = { url = "https://files.pythonhosted.org/packages/a1/d4/1fc4078c65507b51b96ca8f8c3ba19e6a61c8253c72794544580a7b6c24d/packaging-25.0.tar.gz", hash = "sha256:d443872c98d677bf60f6a1f2f8c1cb748e8fe762d2bf9d3148b5599295b0fc4f", size = 165727, upload-time = "2025-04-19T11:48:59.673Z" }
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@@ -175,7 +175,7 @@ wheels = [
 [[package]]
 name = "pluggy"
 version = "1.6.0"
-source = { registry = "https://pypi.org/simple/" }
+source = { registry = "https://pypi.org/simple" }
 sdist = { url = "https://files.pythonhosted.org/packages/f9/e2/3e91f31a7d2b083fe6ef3fa267035b518369d9511ffab804f839851d2779/pluggy-1.6.0.tar.gz", hash = "sha256:7dcc130b76258d33b90f61b658791dede3486c3e6bfb003ee5c9bfb396dd22f3", size = 69412, upload-time = "2025-05-15T12:30:07.975Z" }
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@@ -184,7 +184,7 @@ wheels = [
 [[package]]
 name = "pygments"
 version = "2.19.2"
-source = { registry = "https://pypi.org/simple/" }
+source = { registry = "https://pypi.org/simple" }
 sdist = { url = "https://files.pythonhosted.org/packages/b0/77/a5b8c569bf593b0140bde72ea885a803b82086995367bf2037de0159d924/pygments-2.19.2.tar.gz", hash = "sha256:636cb2477cec7f8952536970bc533bc43743542f70392ae026374600add5b887", size = 4968631, upload-time = "2025-06-21T13:39:12.283Z" }
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@@ -193,7 +193,7 @@ wheels = [
 [[package]]
 name = "pytest"
 version = "9.0.2"
-source = { registry = "https://pypi.org/simple/" }
+source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "colorama", marker = "sys_platform == 'win32'" },
     { name = "iniconfig" },
@@ -209,7 +209,7 @@ wheels = [
 [[package]]
 name = "rich"
 version = "14.2.0"
-source = { registry = "https://pypi.org/simple/" }
+source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "markdown-it-py" },
     { name = "pygments" },
@@ -222,7 +222,7 @@ wheels = [
 [[package]]
 name = "typing-extensions"
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-source = { registry = "https://pypi.org/simple/" }
+source = { registry = "https://pypi.org/simple" }
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