17old new to btc

Hi, I am a 17 year old student who has invested his first 500$ in btc. I have a couple of questions:

• I know that i will experience highs and lows and thats no problem since I plan to hold it to my 30s but is there a way that btc can crash and i should sell?

• I currently have 1500$ that I can invest and lose so should I do it now, divided into weeks or wait till the next low?

• is there some kind of liquidity pools or so? Since I plan to hold it for a long term can I stake it or so to get a APY.

Thanks in advance!