Twitch revenue tax?

I've just signed a Twitch affiliate contract and I expect to earn a little over 100 euro a year. Can I simply state this amount under "other" on my tax return?

Can I simply state this amount under "other" on my tax return?

No, the whole thing is entered here:

https://www.elster.de/eportal/formulare-leistungen/alleformulare/euer

The whole thing connects with your business, of course, what you certainly already have because you know that it is mandatory if you intend to make a profit.