Debugging

Question

Umm i wrote this code,this is my first code. Why are there so many errors in it?
https://code.sololearn.com/c0p9GvAAW5ZQ/?ref=app
https://code.sololearn.com/c0p9GvAAW5ZQ/?ref=app

Answer 1

Remove 'public' on var life then put game over in " " like this ("game over")

Answer 2

but why is that the case