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diff --git a/Technology/6.0001 Introduction to Computer Science and Programming in Python.md b/Technology/6.0001 Introduction to Computer Science and Programming in Python.md
index 2521eaf..d327cc0 100644
--- a/Technology/6.0001 Introduction to Computer Science and Programming in Python.md
+++ b/Technology/6.0001 Introduction to Computer Science and Programming in Python.md
@@ -54,7 +54,7 @@ Sementics
 - Prog langs: only one meaning
 
 Everything in Python is an object:
-- Scalar(int,float,bool(true/false),None)
+- Scalar(int,float,bool(true/false),None,str)
 - non-scalar(type())
 
 <expr> = <var>
@@ -63,3 +63,88 @@ x % y = Remainder when x/y
 x ** y = x to power of y
 
 # Lecture 2 - Branching and Iteration
+
+== vs = comparaison vs assignement
+
+a variable is just a name, object can be assigned to more than 1 var
+can assign multiples var in one line <><>=<><>
+
+Operators can be combined to form expressions, the value of the expression is an object of some type()
+
+## Arithmetic Operators
+- +  : Addition
+- -  : Subtraction
+- *  : Multiplication
+- /  : Division
+- %  : Modulo (remainder)
+- ** : Exponent
+- // : Floor division
+
+## Comparaison Operators - Compare 2 value and return true or false
+- == : Equal to
+- != : Nor equal to
+- >  : Greater than
+- <  : Less than
+- >= : Greater than or equal to
+- <= : Lesser than or equal to
+
+## Assignement Operators - Assign value to var
+- =  : Assignement
+- += : Addition assignement
+- -= : Substraction assignement
+- *= : Multiplication assignement*
+- /= : Division assignement
+- %= : Modulo assignement
+- //= : Floor division assignement
+- **= : Exponentiation assignement**
+
+## Logical Operators - To combine conditional statements
+- AND
+- OR
+- NOT
+
+## Bitwise Operator - Operate on Binary numbers
+## Membership Operator - Check if value is part of sequence
+- in
+- not in
+## Identity Operator - Check if 2 object refer to the same memory location
+- is
+- is not
+
+ Variables can't start with a number
+ Variables are case sensitive
+ Keywords(reserved words) can't be used
+ Identatation sementically meaningfull
+
+ Strait Line Programs VS Branching Programs (ex: with conditional expresion)
+
+
+ slicing = sequence[start:stop:step]
+ 'abc'[:] = 'abc'[0:len('abc')]
+
+when convert float to int : truncated not rounded
+
+fstring - to format strings
+
+f"Hello {name}, you are {age} yrs old"
+can include any expression in bracket
+f"The area of a circle with radius {sum(radius)} is {math.pi * radius}"
+
+## Conditional Statement
+- if : execute if true
+- if, elif, else
+
+## Looping Statement
+- for - Iterate over a sequence
+- while - Repeat a block of code as long as condition is true
+
+# Control statement
+- break - exit current loop
+- continue - skip rest of current iteration and follow to the next iteration in loop
+- pass - null does nothing
+
+range(start,stop,increment)
+
+PEP8 - https://peps.python.org/pep-0008/
+
+# Lecture 3 - String Manipulation, Guess and Check, Approximations, Bisection