Dear friend, I hope that on your journey through the Bitcoin rabbit hole you manage to stay away from anything other than Bitcoin.

Bitcoin although it seems very complicated the matter is simple.

Bitcoin currency

Mining which means PoW

Nodes that validate the work of miners, also means PoW

The L2 layer which is Lightning.

Whatever outside of that, any NFT, PoS, PoX garbage sorry but it's SHIT and SCAM