My custom gaming pc computer build set up from November 2019

What is the most important components to focus on?

What is needed entirely

Case

Power supply

Motherboard

Processor

Ram

Graphics card

Solid state hard drive

EVGA Geoforce RTX 2060 XC ULTRA—

Ryzen 5 3600———————

Asus tuf gaming X570+——-

Corsair DDR4 vengeance pro—

970 Evo plus 500 Gb————

Case———————————

CX 750 power supply————