As discussed in the course outline, we will not require a set text.
Two textbooks that I recommend as good sources, and which should be reasonably easy to follow along in, are:
I am much less enthusiatic about the following textbook, but it has the advantage of being free-to-download:
The following textbook is nicely written and clear, but from a somewhat more advanced perspective. I particularly liked some of the discussion in it of the construction of the real numbers with Dedekind cuts.
We will have a lively online discussion in the UP e-classroom system. Asking and answering questions of your peers will be of great benefit to your development.
Wikipedia has a number of articles on mathematical topics. They are mostly well-written and accurate, but the levels that they are written at vary, and some will be too hard or too simple to be helpful for you.