Buy gaming pc cheap where?

I would like to buy a gaming PC, which should not cost more than 200-300 euro. Games I play are GTA, Fortnite, etc… I would like to be able to play smoothly

For 200-300 euro this will be very difficult since the PC can't contain a graphics card, but only a Vega APU. Gaming doesn't make sense.

You won't even get a normal good PC for that.

Especially gaming PCs cost around 1000-2000 euro.
My friend bought a gaming PC for 2000-3000 and everything goes smoothly.

For a good PC, you have to do more sheet metal.

But with a GTX 1050 / I7- 7.Gen everything works?

New? > not at all!

For the money you could share me cheap used parts from the bay maybe put together a gaming-compatible PC. But you should know a little bit about hardware so that you don't turn on electronic waste.