My questions are, that if I will buy it at Binance, should I open account for every crypto, or just one for all? And how about staking these planned cryptos, where should I stake them?
You don’t have to create lots of accounts, you just have to find a good wallet that you will use in storing the coins, wallet like Exodus might be a good option as it allows you to store lots of different cryptocurrencies, unless you want to make use of Binance wallet in storing the coins you’re going to buying, though I don’t recommend an exchange wallet.
Then as for staking, if you buy crypto.com coin (CRO), it would be best to stake it on their website as that will get you more return on your staking, up to 18%. Check out their website to understand better.