Welcome to the crypto world. 
My questions are, that if I will buy it at Binance, should I open account for every crypto, or just one for all?
As long as all of those cryptos are supported and traded in Binance, you only need one Binance account.And how about staking these planned cryptos, where should I stake them?
If Binance has that coin supported for staking and they have it on their feature, you can stake it on them. But most of the staking coins have their own wallet and you need to download and deposit it on that wallet.Second thing, that I read something that every crypto has different blockchains, and when I wanna send one of my cryptos to my wallet, somehow it can be loss, because Ethereum can not be send to Bitcoin wallet? In this I totally confused, where I can send, where I can not, how can I lose my coins.
Thanks, best all.
That's right. Transactions must be done for every specific coin. Bitcoin for bitcoin, Ethereum for Ethereum. Take note of that. Always check the addresses and crypto that you're sending. You send Ethereum to an Ethereum address. Litecoin to Litecoin and so on.Thanks, best all.
It seems to me that for a start, this friend should have tightened up basic knowledge in the field of cryptography before starting to plan to buy any kind of coin. Based on what considerations he will choose the coins to buy. You need to understand basic things, and then make purchases in order not to regret what you have done in the future.