Staking more than 3 different coins?

I have been trying to look up an answer but I was wondering if someone knew if we could stake more than 3 different coins at a time?

I tried to stake 4 different coins recently and the last one is sitting there and it says there is an estimated interest of 0.

Is this because you can only stake 3 lots of coins at a time?

Also, can you stake more than 2 lots of the same coin. Like stake 5 BNB one day then stake another 5 BNB the next.

Sorry, I’m a noob and can’t seem to find the answer in online forums.