Computer systems today are increasingly complex, and are changing all the time, growing in complexity while shrinking in size.
Even the most basic home system is going to have at least a desktop or laptop, a router, perhaps with wifi, and some way of connecting to the internet, such as a cable modem. It probably also has a printer, and there may be other computers sharing the internet connection. Besides all that, there is a wealth of software to install and learn how to use.
Besides installing all that, and configuring it, and learning how to use everything, you may have many questions, and you will eventually encounter problems that need to be solved.
I am happy to help with all of that.