You've already made it clear, as well as I have, that I'm not a native speaker.
And if you don't think you can trust my English, you don't have to memorize
any word or expression that I happen to use. In fact, no one can prove
how trustworthy their English is, whether native or nonnative.

We can't even trust English native speakers for that. I myself
don't trust anyone who happens to write anything on the Internet,
not even in published books that seem to be legitimate.
You know very well even seemingly authoritative books make mistakes.
So, if I were you, I don't trust anything or anybody 100 percent.
All I trust is what I've proved to be true only after making sure that
at least several books that seem authoritative prove it's true.

When I learn any English words or expressions, I only learn them
from books published by authoritative publishers and written by
authoritative writers. Whenever I find anything on Twitter, YouTube,
2-channel, or elsewhere, I read it and put it to memory on a temporary
basis only. Then, only after having proved the trustworthiness of
each such thing that I happened to find on the Internet or in books
that I can't prove to be authoritative, I memorize it on a permanent basis.

But I don't even trust such seemingly authoritative information 100 percent.
This world is a jungle. No one is 100 percent right. Even Harvard professors
may make mistakes.

On 2-channel, some commentators read like native speakers. But
how far can you trust them? Can you prove that they're always saying
the right thing? For example, many native speakers, not only Japanese
teachers, assert that it's wrong to start sentences with such conjunctions
as "but" or "and." But that assertion is totally wrong. It's a stupid myth.
I've proved it here in this thread, as well as elsewhere.