Are there articles on setting up / debugging a PC for ordinary users?

Question

Do it yourself

Our city is small, I am a student of a local technical school with a degree in programming. In the near future, a car will appear, and this will entail some expenses that it is time to cover by myself, but as far as I am not bad at computers and operating systems, I decided to earn extra money for myself as a "programmer" on call.
From the fact that I am quite good at computers and know a lot of things, I am almost sure that I still have a lot to understand and it would be better to prepare in advance. From this my question arises, but are there any manuals or guides on the network on the topics that ordinary users usually ask from such "tyzhprogrammers"?
P.s. I plan to advertise on a local forum/public if clients come,

Answer 1

A very frequent order is a request to "install / reinstall Windows and all programs." And here the fighters with non-licensed software can react much faster than the tax authorities. Organize a control purchase according to your advertisement. So direct such customers on the right path right away.
And so, pick up to your taste software for all sorts of emergencies - for system recovery, antiviruses, for testing hardware. Duty task - the computer is not loaded / slows down. Router configuration may be required for local ISPs. Well, and so on.