Programming Fundamentals
Identifiers are simply meaningful names you give to variables - think of them as labels that make your code readable. Instead of using random letters, you'd write age = 18 rather than x = 18.
The difference between constants and variables is straightforward: constants are fixed values that never change during your program (like pi = 3.14), while variables can change as your program runs. Variables come in two flavours - global variables work throughout your entire program, whilst local variables only exist within specific subroutines.
Be careful with global variables though - they can introduce bugs when local and global variables share the same name, making your code confusing and harder to test.
Quick Tip: Always use descriptive identifiers - your future self will thank you when debugging!
