Building a new Desktop (Gaming) PC: Step 1 – Planning

In all my 20+ years of computer experience, I have never bought a prebuilt desktop PC (for personal use). In the early days, my desktops were hand-me-downs that I upgraded. Later when I had the money, I built or rebuilt machines to fit my needs/wants. About 5 years back or so, I gave up my desktop PC and switched entirely to laptops. My gaming had migrated primarily onto the Xbox,...