Both ways are fine

Hi I can help you with english!

It is not easy to feel shy and afraid to make mistakes. But something that helps is to remember that everyone understands that you are learning and making mistakes is part of the process. When someone starts learning polish and makes mistakes you understand and try to help. Is the same when you are the one learning another language.

"Me deixou de lado" ou "me chutou" (Sentido figurado)

Yes, they all make sense. Of course, there is always a different or more natural way to say these things, but it depends if you want to sound natural or formal.

Turn-on seems to be an adjective here. In the context it is simply saying that there is an specific level that turns the flow on or off. Of course it's hard to be sure unless you have read the whole article.

The way you said it is correct!