Answer:
For main requirement you'll need
A CPU ( Central Processing Unit)
A GPU (Graphics Processing Unit)
Motherboard for your components to work and transfer data
PSU (Power Supply Unit) for your components to turn on
A RAM (Random Access Memory)
For others you need
Cooler it can be by air, an AIO (All in one water cooler) or an water cooler but water might have a chance of risk to cause shortage for you pc components of it's not secure
Fans for excessive heat and for airflow
A case to keep your components safe and secure
Monitor to see what's going on
Keyboard, mouse, headset, mic, cam