My favorite book has always been The Hobbit, by Tolkien, and part of the reason I'm such an avid reader today.
Two fantastic books/series I've read recently
For those who want a deeper, more philosophical book, look no further than The Screwtape Letters. It's C.S. Lewis's thoughts on what it means to be close to God, how to get close to God, and why we struggle trying to find Him, but the twist is, it's told through the lens of the demon Screwtape, adding another aspect to these questions I had never considered. 10/10 I'm still thinking about it weeks later.
Another fun one for all those fantasy lovers (like me :D) out there is The Wheel of Time, by Robert Jordan. This series is considered one of the greatest fantasy masterpieces for a good reason. The character development, world, and plot are just top notch and I'm even rereading this series for the second time to catch all the crazy foreshadowing, hints, and other easter eggs I missed the first readthrough. I'm honestly obsessed with this series. The best part (or maybe the worst LOL) is that this series is SUPERRRR long, 14 books of around 700 pages each, so if you have a ton of time on your hands or just want something that will keep you occupied and you can't put down for 6 months, I highly recommend.