Newbie question about taxes

I am completely new to the depot business. I have had 0 financial education and have no competent contacts in my life. But I have now taken courage and invested part of my daily savings in ETFs. I was lucky enough to do this in April 2025. Since then, the value of the portfolio has increased quite a bit, to say the least. And now I'm sitting here and I really have zero idea about taxes. Are these capital gains already taxed? Do I have to put them in the