PC setup consists of Internal and External elements.

Internals

Essential: CPU, RAM, Storage(HDD, SSD), GPU Support: PSU(Power Supply Unit), Cooling system(air/water), Motherboard

Externals

  1. Mouse(400-1600 DPI), Keyboard, Mousepad
  2. Monitor, Studio Headphones (+ DAC/+ AMP)
  3. Desk, Chair

Monitor

Aspects to keep in mind on buying a monitor:

  1. Refresh Rate (144/240/360 Hz)
  2. Resolution (HD/4k/8k)
  3. Panel Time (VA/IPS/OLED/QLED)
  4. Size (32-42 inches)
  5. Response Time (<1ms)

Source: WINNER: The Ultimate Guide to Gaming