Welcome to this forum.

You ask for help in an own topic nearly half an hour after you registered. I can only assume you haven't silently read much here before. May I ask why? What hinders you to explore the forum for as much time as needed first. Does anything rush you?

A lot you asked you could've figured out yourself. Finding pinned threads and what purpose they have isn't exactly difficult and/or a mental challenge. Isn't it more satisfying to explore and find answers on your own?

Take your time and maybe ask less to be spoon fed, that would be great. As it was recommended to learn more about Bitcoin, here's my goto place:
https://learnmeabitcoin.com