https://hackernewsbooks.com/search?q=algorithms - Books collected from numerous HN threads and comments. That's the list of algorithms (in the title) books that have been recommended in the past. Introduction to Algorithms by Cormen et al. is one I like, but I'm not sure how good it is for self-study. Algorithms by Sedgewick seems (from past discussions) more highly recommended for self-study, but I've never looked at it.