Can I believe my feelings?

What can I believe?

Who can I believe?

Is knowledge “justified, true opinion with explanation”, as they say since Plato?

What is knowledge?

Is general doubting of facts naive?

Does doubting in something only make sense if I have some hint that it’s wrong?

Do I have to have reasons to doubt?

Am I not always entitled to doubt?

Who determines what the “correct”, “valid” interpretation is?