Below, you can see some recommended ebooks on IT skills that are available on the ProQuest eBook Central platform. You need a username and password to access them. To get access, ask your teacher to contact the library or look at the content and access page of the platform guide. You can request an account yourself here with your college or training centre email (if you use a web mail account, we'll just ignore the request, sorry)
There's a guide to the platform available here with a lot of information on the platform and its features, which are summarised in a one-page quick guide
Basically, you can read these books online or download them to your device. Reading online offers more features, like making notes and highlighting text, while if you want to read them on your device you need to install a special app, so we'd recommend reading them online.
You can see some more relevant titles here