Reddit reviews Anthropology: Appreciating Human Diversity

One approach would be to search for syllabi for undergraduate anthropology courses and see what texts they require. Then you could work through different "courses" on your own.

For example, an older edition of this book was used in my intro to anthro course when I was an undergrad. Something like it or one of its competitors might be a good place to start. If you live in a metropolitan area, I'm sure your public library has plenty of books to get you started.