diff --git a/src/dict.md b/src/dict.md
index e8cf504..6a97771 100644
--- a/src/dict.md
+++ b/src/dict.md
@@ -8,7 +8,7 @@ The code below assigns a dictionary to a variable which then can be called and m
 example_dict = {"one": 1, "two": False, "three": 3, "four": 4}
 ```
 
-### Access
+## Access
 
 There are multiple ways to perform this action, as shown below.
 
@@ -20,7 +20,7 @@ example_dict.values () # Gives a list of values
 example_dict.items() # Gives a list of items of (keys, values) as tuples
 ```
 
-### Change
+## Change
 
 There are multiple ways to perform this action, as shown below.
 
@@ -29,7 +29,7 @@ example_dict ["two"] = True # Changes the value of key "two" to True
 example_dict.update ({"four": False}) # Changes the item with the key "four"
 ```
 
-### Remove
+## Remove
 
 There are multiple ways to perform this action, as shown below.
 
@@ -38,7 +38,7 @@ example_dict ["five"] = 5 # Adds a new item of "five":5 to the dictionary
 example_dict.update ({"six": 6}) # Adds the item to the dictionary
 ```
 
-### Looping
+## Looping
 
 This is used to access every single item or value/key, depending on the iteration loop. 
 
diff --git a/src/file.md b/src/file.md
index 02555d3..e9a30c0 100644
--- a/src/file.md
+++ b/src/file.md
@@ -2,17 +2,17 @@
 
 The following code shows how to read, modify and close the files with their particular order. 
 
-### Always open the file with read, append or write, modify, then close the file.
+## Always open the file with read, append or write, modify, then close the file.
 ```python
 example_file = "file-name.txt"
 ```
 
-### Opens file and "r" read (error if does not exist), "a" append and "w" write
+## Opens file and "r" read (error if does not exist), "a" append and "w" write
 ```python
 infile = open(example_file, "r")
 ```
 
-### Returns one line, if called twice, it reads first two lines of the file
+## Returns one line, if called twice, it reads first two lines of the file
 ```python
 infile.readline() 
 infile.close() # closes the file
diff --git a/src/lists.md b/src/lists.md
index 60b7007..2216329 100644
--- a/src/lists.md
+++ b/src/lists.md
@@ -8,7 +8,7 @@ The following code assigns a list to a variable, which will then be used to mani
 example_list = ['a', 1, True, 4, 6, 'b']
 ```
 
-### Access
+## Access
 
 ```python
 example_list [-1] # Backwards accessing
@@ -16,7 +16,7 @@ example_list [2:5] # Third, Fourth and Fifth item
 example_list [2:] # Access from third time to the end of the list
 ```
 
-### Change
+## Change
 
 ```python
 example_list [0] = 'c' # It is not 'a' anymore, it is 'c' for the first element
@@ -24,14 +24,14 @@ example_list [1:3] = ['x', 3] # The second and third item are now 'x' and 3
 example_list [1:3] = ['r'] # Replaces the range of items with just one item 'r'
 ```
 
-### Add/Extend
+## Add/Extend
 
-### Without replacing, 'b' slides in between the the second and third item
+## Without replacing, 'b' slides in between the the second and third item
 ```python
 example_list.insert (2, 'b')
 ```
 
-### Adds 'q' to the end of the list
+## Adds 'q' to the end of the list
 ```python
 example_list.append ('q')
 ```
@@ -41,12 +41,12 @@ Extend -> extend () works for any iterable objects e.g. tuples, sets, dictionari
 ```python
 example_list2 = ['l', 10]
 ```
-### Adds the entire example_list2 list to the end of the list as elements
+## Adds the entire example_list2 list to the end of the list as elements
 ```python
 example_list.extend (example_list2)
 ```
 
-### Remove
+## Remove
 
 ```python
 example_list.remove ('a') # Removes the specific item
@@ -55,7 +55,7 @@ example_list.remove ('a') # Removes the specific item
 `example_list.clear() # Keeps the list empty by removing all elements
 ```
 
-### Looping
+## Looping
 
 ```python
 # For-Loop for each item
diff --git a/src/sets.md b/src/sets.md
index 212dfd9..ff1a4a8 100644
--- a/src/sets.md
+++ b/src/sets.md
@@ -8,7 +8,7 @@ The following code assigns a sample set to a variable, which can then be used to
 example_set = {1, 'a', True}
 ```
 
-### Access
+## Access
 
 ```python
 for x in example_set:
@@ -17,30 +17,30 @@ for x in example_set:
 
 As part of access, you can check if a certain item is in the set, as shown below. 
 
-### Check if in list -> Returns True or False
+## Check if in list -> Returns True or False
 ```python
 check = 1 in example_set
 ```
 
-### Add
+## Add
 
-### Add Item
+## Add Item
 ```python
 example_set.add ('b')
 ```
 
-### Add two sets ~ update() can be used to any iterable objects
+## Add two sets ~ update() can be used to any iterable objects
 ```python
 example_set2 = {2, 'c', False}
 example_set.update (example_set2)
 ```
 
-### Remove
+## Remove
 
 ```python
 example_set.remove ('a')
 ```
-### If 'a' does not exist, then discard() does not raise an error
+## If 'a' does not exist, then discard() does not raise an error
 ```python
 example_set.discard ('a')
 ```
\ No newline at end of file
diff --git a/src/string.md b/src/string.md
index b42e0d4..20b0f22 100644
--- a/src/string.md
+++ b/src/string.md
@@ -8,7 +8,7 @@ The following code assigns a string to a variable, which then can be used to man
 example_string = "Hello, World!"
 ```
 
-### Access
+## Access
 
 ```python
 example_string [1] # prints the second element in the string, in this case, 'e'
@@ -16,28 +16,28 @@ example_string [2:5] # range
 example_string [5:] # slice from 6th to end
 ```
 
-### Modify
-### returns string in all uppercase
+## Modify
+## returns string in all uppercase
 ```python
 example_string.upper ()
 ```
 
-### returns string in all lowercase
+## returns string in all lowercase
 ```python
 example_string.lower ()
 ```
 
-### removes whitespaces from beginning or at the end
+## removes whitespaces from beginning or at the end
 ```python
 example_string.strip ()
 ``` 
 
-### repalces the argument 1 with argument 2 in the original string
+## repalces the argument 1 with argument 2 in the original string
 ```python
 example_string.replace ("H", "j")
 ``` 
 
-### returns a list with the words being being split at the given argument
+## returns a list with the words being being split at the given argument
 ```python
 example_string.split (",")
 ```
diff --git a/src/tuples.md b/src/tuples.md
index d666621..5a7269a 100644
--- a/src/tuples.md
+++ b/src/tuples.md
@@ -8,13 +8,13 @@ The following code assigns a tuple to a variable, which will then be used to man
 example_tuple = (1, 'a', True)
 ```
 
-### Access
+## Access
 
 ```python
 example_tuple [1] # access
 ```
 
-### Update
+## Update
 
 ```python
 tuple_list = list(example_tuple)
@@ -22,7 +22,7 @@ tuple_list [1] = 'b'
 example_tuple = tuple(tuple_list)
 ```
 
-### Unpack
+## Unpack
 
 ```python
 (x, y, z) = example_tuple