I also like Lang's book. However it has Lang's special take on textbook writing. It explains very clearly the ideas, and steps of arguments. But as I recall it is a bit short on routine exercises, and there is very little repetition. We learn not just by hearing or seeing but also by doing, and hence one should probably augment Lang's clear explanations by some tiresome sets of exercises which give one practice at computing what he has explained. But it has been many years since I saw his book. Maybe it has been expanded. At the time I thought, wow this is so clear and brief, why is it not more popular? So be aware that while people who know the subject well, llike micromass and I, think it is as clear as can be, some beginners think it is too terse.
OK I have looked a bit online and it seems the book with that title today is 2 or 3 times as long as the one from 1964 with that same title. Perhaps they have combined his earlier books, first course and second course, and maybe more into one book. The earlier book was about 250 pages and this one is well over 600 pages and has several variables calc in it as well as one variable. Still it is quite possible it does not have a huge number of exercises, so I would look at it and try reading and learmning something from it.
If you arte just buying this book used say, check which edition you are getting,a s they cost about the same, and the 5th edition seems to have maybe twice as many pages and as much more content.
Lang can give some of the clearest explanations you can find anywhere. He can also skip completely over things you may well want to know, and give far fewer examples than needed to master a subject, especially in his famous algebra book, which also has been expanded by many pages from the1960's edition I have.