It is a whole bunch of stuff, isn’t it?
When I first came into the Church, I thought that the CCC explained everything that the Church knew about a given topic.
Let me try an analogy.

Reading on a particular doctrine from just the CCC is like reading a book chapter on the brain out of a very high quality textbook, versus reading all of the thousands of research studies which led the writers of the book to present the brain in the manner that they did. One can certainly learn the basics through reading the chapter, and the understanding gained may not be wrong. However, it is also fair to say that one will never have the full and complete understanding of what we know about the brain without going back to read the original research. For the vast majority of people however who do not have questions beyond a certain level, reading the book chapter will be enough to satisfy their needs.
The same goes for the catechism. I would guess that 99% of Catholics have no desire or need to read anything beyond the CCC, and they are not wrong for being in that position. The doctrines all make sense to them and they are busy living out their lives of Faith as best they can. However, on occasion someone desires to go deeper and to have a more full understanding of the topic. In that situation, like the the book chapter which was not wrong on anything, simply reading the same thing over and over again will not take someone past a certain point when it comes to depth of understanding. At that point, one needs to go back and examine the sources to see how the original author presented things. Heck, that’s one of the reasons that the CCC references things throughout the entire book, so that people can go read the references and come to a fuller understanding!
Does that make any sort of sense at all, am I just screwing you up?
Since that list seems to be too much for you right now, you might be able to get away with a good pre-Vatican II catechism to start with so that you can do your comparison. You have already said that you find the explanation from
Fundamentals of Catholic Dogma to be unclear, so we can scratch that one. However, perhaps you might check out the
Catechism of the Council of Trent for a description which works for you. I have also heard good things about
My Catholic Faith, but I have not read it.
I’m sure others will have some ideas as well.
+Pax