Science Fiction and Fantasy Books

I write mostly science fiction. I currently have fifteen published books. Of those, five are fantasy novels. I consider myself primarily a science fiction writer. I just had an idea for a fantasy universe and I loved exploring it in those five books (and one short story). I'm thinking about going back to that universe. But I'm also thinking of some stand-alone science fiction novels.

As a writer, I am, of course, a reader. If you're not a science fiction or fantasy reader, here are some books (besides mine) to jump into the genres with:

Science Fiction

The Moon is a Harsh Mistress by Robert Heinlein. It hasn't aged completely well (it was written in the 1960s), but it's still one of the best science fiction novels out there.

A Knight of Ghosts and Shadows by Poul Anderson. I love all of Anderson's books and stories about Dominic Flandry.

Ringworld by Larry Niven. The first (and best) of the Ringworld books. Apparently, this concept was ripped off for the Halo video games. Was also used in a recent Bobba Fett episode on Disney+

Niven's "Tales of Known Space" is a great collection of short stories.

Fantasy

I don't read a lot of fantasy, but here are a couple of my favorites (that I didn't write):

Three Hearts and Three Lions by Poul Anderson. This is one of my favorite fantasy novels (you can hardly go wrong with books by Poul Anderson).

Glory Road by Robert Heinlein. A fun book and written in Heinlein's style. 

The Princess Bride by William Goldman. Yes, the book is better than the movie. Be sure to read the foreword and other "interruptions" to the story. It's a funny fantasy novel.

There's six books to get you started. Let me know what you think of my list or you have books to add in the comments below.