This brand new member above me has sufficiently answered your questions and concerns.
- 1. Bitcoin is moving forward, not stagnant at all.
- 2. The Bitcoin mining energy issue for me is blown out of proportion. But it is being addressed just the same.
- 3. Decentralization =/= Stagnation.
- 4. Bitcoin is the "main one" because it is the father of everything, the prime mover. And it is not in any way threatened by any single altcoin or even all of them combined.
- 5. There is still a team behind Bitcoin, responsible for seeing to it that everything runs smoothly.
Welcome to trading, by the way. Keep safe, avoid getting emotional, and good luck!