I just found out that Ben A. Warburton's book Calvinism is freely online. It was one of the books I read that I found to clearly explain the basics of Calvinism. It's similar to the earlier published book by Loraine Boettner's titled, The Reformed Doctrine of Predestination, but doesn't go off into tangents and speculations like Boettner's does. I agree with some of the speculations and tangents Boettner makes in his book, and others I think are unnecessary, or false or are misleading. For example, I myself am now a postmillennialist, but Boettner gives a false impression by speaking as if Calvinism and postmillennialism are necessarily linked. Boettner speaks about physics in a Newtonian fashion and correlates that with Calvinism's doctrine of God's exhaustive providence. But Newtonian physics has been replaced by quantum physics in the world of science, and so the correlation that Boettner makes no longer works. Though, I do not think that quantum mechanics undermines God's exhaustive providence. With qualifications like that (and others) I can recommend Boettner's book [linked above]. But I don't need to make such kindS of qualifications in Warburton's book. Here's the link:
Calvinism by Ben A. Warburton
https://catalog.hathitrust.org/Record/001594563
OR DOWNLOAD PDF HERE