Where can I learn algebra for when my professor fails?

So, my algebra professor is less than awesome teaching-wise. He’s a sweet old man, but he’s not that clear, switches into “new math” mode randomly, and mumbles both in speech and in writing. It’s ok, it’s a community college class. Luckily, I already know most of this stuff, but it’s been about 10 years since I last learned it, so I could use some resources for when I couldn’t understand what he was talking about.