A PC can be built by first selecting several main parts such as a processor, motherboard, RAM, storage, power supply and a case. Install the RAM and the CPU on the motherboard and mount it on the case. Place in the storage drive and plug in the power supply cables. Install graphics card (where necessary) and connect all the parts. Last, boot into the system and install an operating system such as the Microsoft Windows.
To build a PC, install the CPU and RAM on the motherboard, mount the motherboard in the case, add storage and GPU, connect the power supply, tidy cables, then boot up and install the operating system. Make sure all components are compatible.