Buying crypto with debit card.

I recently made a Binance account, verified it and now I looked into the process of buying.

Apparently there's a minimum 20 euro minimum to get funds in minus like 2.5% for the processing fee. And that requirement is for every transaction? I wanted to get like 50 euro in, divided into some coins I pre-picked but this is starting to confuse me.

So can't I just put in 50 euro as is and then buy the coins I want? Because I wasn't planning on dumping 20 euro per coin. I wanted some small investments in rising crypto's and the rest in more "secure" ones. Out of that 50 I wanted to get 40 in stable coins and 10 divided into smaller coins.