I'll leave the others to answer other questions, but this, you should know that holding bitcoin is not just to make an income, just so you know, lots of people becomes poor in one night holding bitcoin because of poor of decision making and understanding how investing in bitcoin works. It's the same on staking coins, but regarding the staking in etoro they dont have staking for bitcoin, based on their staking page^[1], they only supports ADA and TRX

[1] https://www.etoro.com/crypto/staking/