My linear algebra and multivariate calculous were not as good as I wanted them to be, so I was searching for books on the topic and those two were suggested. Then I saw that the author (Alan Macdonald) had additional material on his YouTube channel, took a peek and found them helpful.

I really enjoyed his writing style and found GA to have some very interesting abstractions but university took the best of me and I couldn't finish them. Perhaps this summer.