How to end if statement in python

I'm learning python. I have touched on other programming languages ​​for example: PHP, HTML, C #, C ++ etc. But I could not understand Python a bit from the programming languages ​​I listed Uses {} When I try to start an if statement in Python I will have to start with : but I can not find a way to end it. I mean, if the if statement is activated, some code must be executed, so I can not find a way to see which code will be executed when the if statement is activated. I'm 11 years old. This might be really bad question for python programers that because I'm currently learning python