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diff --git a/‎course_contents/1_intro/notes/05. Logical Operators.md
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@@ -1,5 +1,5 @@
 ### Variables
-- A variable is a symbolic type associated with a value.
+- A variable is a name associated with a value.
 - A variable can be named anything, but it has some rules:
     1. It cannot start with an integer
     2. It cannot contain spaces
@@ -24,6 +24,10 @@ Examples of variable names:
 `$current`
 `response#`
 
+**Extra resources**
+
+- [What are variables?](https://python.tecladocode.com/1_age_program/2_variables.html#what-are-variables)
+
 ### Strings
 A string is a sequence of characters surrounded by quotation marks:
 - Single quotes `''`
@@ -54,7 +58,13 @@ Examples:
 
 `"Same as this one'`
 
-
+**Extra resources**
+- [Strings and numbers](https://python.tecladocode.com/1_age_program/1_strings_numbers.html)
+- [String formatting](https://python.tecladocode.com/1_age_program/4_string_formatting.html#what-is-string-formatting)
+- [Strings, Variables, and Getting Input from Users](https://www.teclado.com/30-days-of-python/python-30-day-2-strings-variables)
+- [Formatting Strings and Processing User Input](https://www.teclado.com/30-days-of-python/python-30-day-3-string-formatting)
+- [Formatting Numbers for Printing in Python](https://blog.teclado.com/python-formatting-numbers-for-printing/)
+- [Nested String Interpolation in Python](https://blog.teclado.com/python-nested-string-interpolation/)
 
 ### Integers
 An integer is a whole number of any length that can be positive or negative, written without a fractional element.
@@ -63,31 +73,26 @@ Example:
 
 `-1` `0` `1` `2` `3` `86400`
 
+
 ### Floats
 A float is a number that can be positive or negative written with a fractional element.
 
 Example:
 
 `-100.54` `1.0` `59.1` `10.99`
 
-### Booleans
-Computers only understand binary — `1's` and `0's`.
+**Extra resources**
+- [Numbers, Arithmetic, and Printing to the Console](https://www.teclado.com/30-days-of-python/python-30-day-1-numbers-printing)
 
-This way we can determine if a value is `True` or `False`.
+### Booleans
+In Python booleans are a bool data type having two values:
 
-Strings, integers and other data types can indicate a boolean value.
+`True`
 
-Data types representing False bool:
-- Empty string: `''`
-- Empty list: `[]`
-- Zero int: `0`
-- Zero float: `'0.0'`
+`False`
 
-Data types representing True bool:
-- A non-empty string: `"This string"`
-- A list populated with at least one element: `[100, 55]`
-- An integer higher than zero: `1`
-- A float of which decimal number is higher than zero: `0.1`
+**Extra resources**
+- [Conditionals and Booleans](https://www.teclado.com/30-days-of-python/python-30-day-5-conditionals-booleans)
 
 ### Lists
 - A list is an ordered sequential data type
@@ -110,7 +115,10 @@ Data types representing True bool:
 
 `shopping_list[2]  # cherries`
 
-
+**Extra resources**
+- [What is a list?](https://python.tecladocode.com/2_countries_visited/1_lists.html)
+- [Split, join, and slices](https://www.teclado.com/30-days-of-python/python-30-day-7-split-join)
+- [Extending Python Lists](https://blog.teclado.com/python-extending-lists/)
 
 ### Tuples
 - A tuple is very much like a list, however:
@@ -128,13 +136,20 @@ Example:
 
 `better_readability = ('with', 'parenthesis')`
 
+**Extra resources**
+- [Basic Python Collections](https://www.teclado.com/30-days-of-python/python-30-day-4-lists-tuples)
+
 ### Sets
 - A set is an **unordered** data type
 - Elements of a set cannot be accessed by their indices
 - A set is created by a single pair of curly brackets:
 
 `shopping_list = {'apples', 'milk', 'cherries'}`
 
+**Extra resources**
+- [Sets](https://www.teclado.com/30-days-of-python/python-30-day-11-sets)
+- [Python Set Operators](https://blog.teclado.com/python-set-operators/)
+
 ### Dictionaries
 - A dictionary is created by 3 key components:
 curly braces, keys and values
@@ -147,4 +162,8 @@ employees = {'ID': 16915, 'name': 'James', 'department': ['Sales', 'Accounting']
 ```
 
 - A dictionary is accessed by keys as such:
-`employees['name']  # 'James'`
+`employees['name']  # 'James'`
+
+**Extra resources**
+- [What is a dictionary?](https://python.tecladocode.com/2_countries_visited/1_lists.html)
+- [Updating Python Dictionaries](https://blog.teclado.com/python-updating-dictionaries/)
@@ -5,7 +5,7 @@ Correct uses:
 - The use with strings (concatenation):
 `"My name is " + "James"`
 
-Wrong uses:
+Incorrect uses:
 - Between strings and integers/floats:
 `"The correct number is" + 5`
 `TypeError: can only concatenate str (not "int") to str`
@@ -14,6 +14,14 @@ Wrong uses:
 - The use between integers/floats:
 `93.1 - 50`
 
+- The use between sets (return elements of set_1 that aren't in set_2):
+```python
+set_1 = {3, 6, 9, 7, 5}
+set_2 = {3, 6, 9, 95}
+
+set_difference = set_1 - set_2  # {5, 7}
+```
+
 ## Multiplication `*`
 - The arithmetic use:
 `8 * 5`
@@ -36,7 +44,7 @@ Example:
 `55 // 3`
 
 ## Modulo `%`
-- Based on the Euclidean division
+- It's based on the Euclidean division ([learn more](https://blog.teclado.com/pythons-modulo-operator-and-floor-division/))
 - Start with a **dividend** and a **divisor**
 - It's used to get the remainder between the two operands
 
@@ -47,3 +55,9 @@ The result for `10 % 3` is `1`.
 
 ## Exponentiation `**`
 `2 ** 3` Can be read as: 2 raised to the power of 3, same as `2 * 2 * 2`.
+
+
+## Extra resources
+- [How do mathematics work in Python?](https://python.tecladocode.com/1_age_program/1_strings_numbers.html#how-do-mathematics-work-in-python)
+- [Python's modulo operator and floor division](https://blog.teclado.com/pythons-modulo-operator-and-floor-division/)
+- [Python's divmod Function](https://blog.teclado.com/pythons-divmod-function/)
@@ -41,4 +41,7 @@ Each comparison operator returns True or False
 `10 >= 10  # True`
 
 ### Less than or equal to `<=`
-`10 <= 10  # True`
+`10 <= 10  # True`
+
+### Extra resources
+- [Conditionals and Booleans](https://www.teclado.com/30-days-of-python/python-30-day-5-conditionals-booleans)
@@ -1,5 +1,5 @@
 ## AND
-- Returns True if both operands are true
+- `and` returns the first value if it evaluates to false, otherwise it returns the second value.
 
 Example:
 
@@ -12,8 +12,7 @@ Example:
 
 
 ## OR
-- Returns True if at least one operand is True
-- Reads from the left to the right operand
+- `or` returns the first value if it evaluates to true, otherwise it returns the second value.
 
 Example:
 
@@ -25,11 +24,15 @@ Example:
 | `False or True`   | `True`     |
 
 ## NOT
-- Returns True if the operand is False
+- `not` returns True if the operand is False
 
 Example:
 
 | Statement         | Result     |
 | -------------     | ---------- |
 | `not True`        | `False`    |
 | `not False`       | `True`     |
+
+
+### Extra resources
+- [Logical comparisons in Python: and & or](https://blog.teclado.com/logical-comparisons-in-python-and-or/)