Commercial, taxes. Minecraft Server (SHOP)?

Hi, I wanted to ask if I had a shop for my server that would earn around 10-20 euro a month. And legally take this income from the server for further financing, whether I have to pay taxes.

There's also a max. Maximum amount.

Taxes are probably not, there are exemptions and so.

But I think that if you want to behave correctly, you would have to register a business.