Hello I am newbie I have many questions to ask, this is one of it
What is difference between solo staking and staking pool???
There is no staking in Bitcoin per se, im confused, I think you mean mining and not staking (staking is done on PoS coins, Bitcoin is a PoW coin).
However the way it works is similar: In solo mining or staking you have less chances of mining a block but you will get paid a bigger reward if you do. Whereas in mining pools the rewards come more often but at a lesser amount since it's spread across pool participants. That's basically it.
Note that nobody solo mines anymore in Bitcoin at least that I know of, since the chances are ridiculously small to get lucky, so everyone just joins pools. Probably somewhere there's some crazy guy hoping to win the lottery and is running a solo miner who knows, but that's very rare.