The problem with books about DAWs is that it’s not very economical to publish them. In part because the market for a book on Cubase or Reaper is much smaller than say Photoshop. Also in the time it takes to write & publish a book it will be a bit obsolete since the programs frequently release new versions.
This gap has mostly been filled by videos. Steinberg’s own YouTube channel can be accessed from the Hub in Cubase or here’s a link. But most of the videos here assume a kind of baseline understanding of how DAWs work.
You can also google to find other folks making video’s about Cubase and using DAWs in general.
I’m a big fan of Groove 3 and they have a lot of videos not only about Cubase but general concepts & techniques. The best value way to use them is to get an All Access Pass for a month or two and binge watch.
Some of these like “VST” or “crossfade” have specific meanings while others like “groove” and “effect” are a little looser in meaning. In Cubase a lot of the terminology was adopted from magnetic tape era jargon. Google is really going to be your friend with understanding the lingo. And of course if there is a specific term that is confusing you can ask about it here.