Some tricks to understand what some assembly instructions are doing.
sub __ , sp
subtract the esp by a value. This allocates the subtracted value to the stack. For example, making a argument
char balls[500];to asm code, this would be sub 0x1f4, esp to allocate 500bytes.
Usually when you enter a function and stuff is added to call stack
mov __, sp
sp = 0
clears the stack