Do I get already for about 600-700 euro a good compiled gaming pc with which I can play fluently and vllt even can stream?

Hello I'm looking for a good gaming but I do not want to spend too much I get a decent och for the money or should I pay at least 1000 euro. Play fortnite but have on my current pc constantly fps drops

If you build a PC with AMD hardware, you will get along well with 600 euro and have a powerful thing

https://www.hardwaredealz.com/bester-gaming-pc-fuer-unter-600-euro-gamer-pc-bis-600-euro/

Okay, thanks, I just have no idea how to put this thing together or what I need

Everything is explained in the article. And to assemble there are now enough videos how to do it