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Don't let computers and the computing environment keep you in the dark, blind-folded. Some people tend to believe there's some sort of magic to it, but there never was really. Learning about things sometimes takes away the magic, yes.

And this is just the point. Don't run around blind-folded when there's such a nice tool around for all of us waiting to be utilized. Quite a few things have been accomplished thanks to, or because of, computers.
Clever people, human resources, sound minds and lots and lots of footwork, mistakes and stubborn guys, just like you and me, have spent hours, days and nights, weeks, months and years improving this instrument called computer. They simply put more time into the process than you and I have done so far.

The box, the chassis, is also referred to as the system unit. The most important parts of a computer (desktop PC) are enclosed in this box:

1) motherboard, system board: the main electronic components are mounted and connected onto this electronic board, usually  referred to as the motherboard. Here you'll find the processor (microprocessor) with a fan, a power supply unit, ROM, cache and RAM.
Also, there are usually empty slots (electronic connectors) called expansion slots. Here (into the memory slots) you can plug-in additional (extra) memory boards , SIMMS, also called RAM. The more RAM ("work memory") you add the faster your PC will usually handle various processes considering of course it's a good quality memory board and not the cheapest kind.
Processor speed (= Hz, short for hertz, meaning cycles per second) has a lot to do with it as well, of course.

2) CPU, Central Processing Unit: different input & output devices, as well as storage devices, are attached to  this unit.

3) sound card plugged into one of the expansion slots will add sound facilities

4) power supply, you must have some sort of power for your system to work, AC or DC

5) storage devices: HD (a hard disk drive with a fixed disk to store large amounts of data), FDD (floppy disk drive) for removable diskettes and a CD-ROM drive for reading CD-ROM discs.

A few more things (devices) might be included in a system unit
(system unit= burken, lådan, tornet) but most input and output  devices will be plugged into the back of this box
(box = system unit) using the connectors usually referred to as ports.