HN has a wealth of suggestions on this: https://hn.algolia.com/?q=learning+math https://hn.algolia.com/?q=learning+math The top links that come up all look in

HN has a wealth of suggestions on this: https://hn.algolia.com/?q=learning+math https://hn.algolia.com/?q=learning+math The top links that come up all look interesting to me at first glance, but I am a mathematician by training rather than a programmer, so I can't say for sure.