If you want a breadth of grounded fantasy (IE takes place in our world but contains elements that don't really exist in our world) then I would recommend picking through Stephen King.

If you want to completely escape our world then I recommend the old Conan books or the modern Brandon Sanderson starting with Stormlight Archive.

You have received plenty of Sci Fi recommendations but I will add my own personal favorite (this is one novel in the series): https://en.wikipedia.org/wiki/In_Death_Ground

If you want fiction that is grounded in reality with little to no fantasy elements then the murder mystery genre has quite a few gems that are fun to try and guess the twist of when you are reading. Murder on the Orient Express is great if you havn't experienced the story yet.

given your interest in tech and not being used to fiction maybe try some science fiction short stories?

I'd recommend Issac Asimov's short stories. The robot series for example: https://en.wikipedia.org/wiki/Robot_series. You can read a few of those in a sitting.

I really enjoyed salvation by peter f Hamilton lately if you’re into sci-fi :)

'REAMDE' by Neil Stephenson. It's about a fictional MMORPG and really fun.