Basic coding

fn main() {} Main function
+= increment by 1
_x Use _ to suppress the unused variable warning.
#![allow(warnings)] - remove warnings
% computes the remainder of a division operation, e.g. 21 % 8 evaluates to 5, since 21 divided by 8 leaves a remainder of 5.
rect rectangle
.push() appends an element to a collection. It is valid for a char but for string slice use .push_str().
println!("") macro for printing to the screen.
format!("") macro for concatenating multiple strings.