Multi-picture explanation of all connections inside and outside the computer (novice must see)

As a beginner, to assemble a computer that can be used, the first problem we have to solve is how to connect the many computer accessories and connections smoothly? In order to accomplish this task, it is necessary to deeply understand the various connections inside and outside the computer. The author divides these connections into three parts: outside the host, inside the host and inside the host jumper.