How to hide index files?

Help! I know basic website stuff, but this one is beyond me. I feel like there’s an easy answer though…

Okay, see this?

I do NOT want people to see my files like that. Is there some way I can hide this stuff so even Google isn’t going through it with bots (like they are now)?

I should have said, “How to hide DIRECTORY files.”

I figured that much out. How to hide it…

Is there a way to keep search engines from trolling/caching certain parts of my website?

This should help you out: