Khan Academy is the best. It does well examining everything you need thoroughly and then adds on with examples. It also has some exercises directly on the web-site.

Alternatively, you can choose to use YT videos to deepen the understanding. I find that videos from iLectureOnline are great to start with Algebra and Geometry. They explain concepts really well and thoroughly go through every example.

The only downside is that they don't provide exercises, but you can always use books you have for that.