will I use variables on a regular or is this for special situations?

Answer 1

variables are very important and they are really common in every program. you should use it on a regular

Answer 2

integer - Numbers (any num)
char - Character (alphabets)
float - decimal number (10.123)
boolean - True / False

Answer 3

get used to variables and their different types: int, char, etc

Answer 4

Depends on ur own not nesseciTy but variables always required in code