I have been a newbie as well in this forum and no one ever invites me to join here, so back then I really don't have any idea on how to navigate or where to post in this forum.
In this post, I will discuss some of the helpful links that will help you with all your concerns.

How to earn Bitcoin:
https://bitcointalk.org/index.php?topic=1629118.0

Where can I find Bounties or Airdrops:
https://bitcointalk.org/index.php?board=52.0 (BITCOIN)
https://bitcointalk.org/index.php?board=238.0 (ALTCOIN & Airdrops)

Where to ask questions regarding bitcoin and Altcoin?
https://bitcointalk.org/index.php?board=1.0 (BITCOIN)
https://bitcointalk.org/index.php?board=67.0 (ALTCOIN)

Want to sell products or service?
https://bitcointalk.org/index.php?board=5.0

If you got scam you can report it here:
https://bitcointalk.org/index.php?board=83.0

Want to know more about the forum?
https://bitcointalk.org/index.php?board=24.0

Forum Rules:
https://bitcointalk.org/index.php?topic=703657.0