Beginner questions about in-game programming

Hi everyone,

I just started to (try to) learn programming because of that game (starting from scratch so wish me good luck) and when writing my first code I'm having a problem. I copied the exact same code from at least 3 tutorial videos and done the exact same steps but still, code doesn't work. Here are the screenshots:

https://gyazo.com/599602b1a94d818d3e74e063571383d3

Also, one tutorial didn't use the last line so I tried removing it:...

Beginner questions about in-game programming