https://openstax.org/subjects/math https://openstax.org/subjects/math For free online textbooks these ones seem to have good reputation on the Internet. I did

https://openstax.org/subjects/math https://openstax.org/subjects/math For free online textbooks these ones seem to have good reputation on the Internet. I did the 'pre-algebra' and 'algebra and trigonometry' books, found them good. Do all the excersices (very important), sometimes I got stuck (every books misses edge cases) so be prepared to look at other resources.