What kind of PC would be good for me?

I'm looking for a PC that should mainly be suitable for school things (Powerpoint etc.), but on which you can still play a few games like Minecraft or CS GO without any problems.
Does anyone have any links or tips that I should follow?

So I personally find the processor and the graphics card most important and with what you have in mind with the PC, neither has to be the latest from the latest and no high-end devices are necessary for this (but everything is just my personal opinion)

Put your own PC together with miser?

It is best to research what is good for your REQUIREMENTS.

But for gaming, I recommend you as a graphics card at least one GTX660 for these games. The best would be an RTX but for your requirements a GTX which you want to take is up to you

For the processor use i7 or i9 but as I said, an i7 is enough for your requirements

Think something like that should be more than enough, it depends on which games you want to play.

https://hardwarerat.de/...0-sata-ssd

Can you have it assembled there or do you have to do it yourself?

There you can put together your components and compare prices.

Then you can either buy and build all the parts yourself or tell a PC builder of your trust the components and they will build the PC for you.

As far as I know Geizhals does not build PC's for people.

There you can put it together occasionally and just compare prices