Sciences

This is one of my favorite resources for organic chemistry. Master Organic Chemistry has blog posts on all or almost all of the reactions you'll see in an undergraduate level organic chemistry course. Each post has in-depth explanations of how and why reactions occur the way they do, as well as useful graphics. I highly recommend checking it out.

The webpage isn't the prettiest, but this website has so much information about basically any reaction you might encounter. It's a bit outside the scope of undergraduate level organic chemistry at times, but it can be useful and interesting nonetheless.