This one's free to read! It's a webnovel called "the wandering inn", a litRPG about an innkeeper. Lots of slice-of-life elements with some dark fantasy part sprinkled through it. The beginning parts are a bit rough to read, but it quickly becomes a really engaging time sinker.
Well, or you can just pick up any Brandon Sanderson novel/wheel of time/G.R.R.Martin novel/Tolkien works. Lots of people got into fantasy because of them, might want to check them out.
If you don't mind the rather childish writing and weebness, you can also try out "ascendance of a bookworm", it's one of the few light novels that doesn't want to make me roll my eyes out of exasperation. The plot: A bibliophile is reincarnated into the body of a sickly girl in a medieval fantasy world (Without books!), hijinks ensue. It has surprisingly intricate worldbuilding with tons of quite informative tidbits. I literally learnt how to bind paper through this novel series!