Pick one of the Discworld Series from Terry Prattchet. I have read it as a teen/tween, my wife discovered it a year ago, and we both really like it.

Depending on your tastes:

* if you like straight up fantasy parody, you can go from the beginning, and follow Rincewinds journey, a mage hapless at magic, running away from peril of mostly his own making.

* if you want different take at folk-tales, with a hint of Shakespear and a dash of, dare I say a dash of feminism, follow Witches of Lancre. Granny Weatherwax is an icon!

* if you like noir and urban-fantasy, follow Ankh-Morpork city watch led by daring Samuel Vimes and then continue with introduction of newspaper, resurection of post office, rebuilding of banking system and ushering in the age of steam.

I loved most of them. Didn't regret reading a single one. You might or might not want to refer to a reading guide: https://www.reddit.com/r/Fantasy/comments/8900fu/the_discwor...

For a hard magic system[0] in the fantasy genre, I'd heartily suggest any of Brandon Sanderson's novels.

My favorites are the second set of the Mistborn series (Wax and Wayne), the Stormlight Archives and the Rithmatist.

[0] https://brandonsanderson.com/sandersons-first-law/

Having reached the stage where you are able to distinguish between opinion and fact, i would suggest reading a bit of philosophy. You might find it illuminating and interesting in a different way. Worked for me at a similar stage though your mileage might vary.

I've been reading The Culture series lately! If you're into science fiction then it's a set of very enjoyable reads.

https://en.wikipedia.org/wiki/The_Culture_(series)