npub1al6r4h54n5rwg084g5t2x9646xuzc0jy5vhn9254rvudgfulkwrqxxf3sj on Nostr: Username/Userid/Nip05/Public Keys/Banner URL/IMAGE URL/Nsec/Npub/hex ...

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...