This may sound silly, but I've recently rediscovered just how amazing books are. I guess, compared to the internet, books are a bit obtuse - unlike reddit or youtube, you have to actively dig into them (sometimes it feels like the internet just washes over you.)

But books have huge information density - new lessons and ideas, and most importantly, new lenses to see your world through. Books have a great way of articulating things that you've always known about subconsciously but never really have thought about.