Help! with Functions: Practice makes perfect


I wrote out the code, yet I am receiving this error message

I am receiving this error message. What do I do?
File "python", line 5
If number % 3 == 0:
SyntaxError: invalid syntax

def cube(number):
    return number ** 3
def by_three(number):
    If number % 3 == 0:
        return cube(number)
        return False


keywords (if) are case sensitive, the letters should all be lowercase


Thank you stetim94. This solves it.