Hello Fellow Indie Hackers..... What is means be being Indie Hacker? Introduction,Learning

Hello Fellow IndieHAckers.....
I am new to IndieHackers Community.
What is means be being Indie Hacker?
List down Your:

1. When you start your IndieHacker Journey?
2. Total Projects ?Current Project name and Link?
3. Total Revenue?
4. Biggest Lesson you learn in your journey?