I want to know some useful websites for computer learners containing basic knowledge about computer, software and hardware devices etc.

If you click on the following link, you will find a lot of sites where you could learn about such things.

Free Computer Basics - Google Search

However, if you have direct questions that you would like to post on a new thread or even this thread, there are many people on this site who will be willing to give you free advice.

What are some of the questions that you might have, please?

Thanks!

Teaching them the basics of windows explorer can really help them get around on their computer.