^^ where is the best place to buy them? stock.exchange?
And could someone explain to me what "staking" means?
Staking is an alternative to mining supported by many coins. You keep your wallet open and there is a chance to make a block depending on your unspent balance. The more you have the higher the chance. Very roughly speaking.
Yes stocks.exchange is good and the price seems to have stabilized around 300sat for the last couple days.