u/Human-Pattern-8385

Im quite new to this whole pc building thing, I need help choosing what pc parts I should buy, I don't know much about building one but from what I've looked into it seems if better if I build my own pc rather than getting a pre-built from best buy. Can someone help me out here I want to be able to run games like Fortnite, Gta, Roblox and Minecraft with like mid-high graphics and also a monitor. I do want to stick to a budget around $1.2-1.5k so if anyone can help me out here I would really appreciate it.