Username/Userid/Nip05/Public Keys/Banner URL/IMAGE URL/Nsec/Npub/hex npub/Id/Signatures/Events?

What are all these?

Why do some clients asks for it then?

We know nothing about how these datas can be stolen/used against us?

How they do it?who they are?these things must be simply/properly explained to users...again not all users are english speaking natives...and it is truly becoming a hindrance...