Need help building a gaming PC (budget 800-900€ without PC peripherals) for Prime Day sales!

Hi everyone! I'm hoping some of you can help me out. I'm looking to build my first gaming PC with a budget between 800-900€, and I live in Europe. I already have a mouse, keyboard, and monitor, so I don't need those, but I do need help picking everything else (case, power supply, cooling system, CPU, GPU, motherboard, RAM).

I'm not very familiar with PC parts, so I would really appreciate advice from someone more experienced. I want to build the PC now because the Amazon Prime Day deals are coming up (October 8-9), and I think it could be a great opportunity to save some money!

I'll mainly be using this PC for gaming, so if anyone has recommendations for parts that would fit my budget and give me good performance, I would love to hear them. Thanks so much in advance for your help! 😊