I drive lots on the weekends, so I listen to podcasts. I'm currently listening to "Behind the Bastard" and I'm spending time here and there reading up on very dark history that I was never taught in any level of school.
So to answer your question, podcasts and reading! I've also made lists and info sheets on all sorts of things like what to look for in health food supplements, what my regiment is when I'm sick, list of books to read, ideas for birthday gifts, price comparisons.. I also recently bought a Kalimba so that's keeping me busy, too. It's an instrument that's easy to carry, so I dream of being able to play it by a camp-fire since I am hopeless at guitar.
I don't have a lot of stuff and not a lot of expensive stuff, but my top are:
Instant Pot. I have a tiny kitchen, so being able to do x number of things with one piece of equipment is amazing. Also keeps the heat down in summer instead of oven and gas stove.
Hiking poles. Got them recently, and they are a game changer. I've only ever seen older folks use them, but they got it right. Not only is it easier on my knees, but somehow they feel like they let me go further when I can use my arms as a little push forward.
Garmin Fenix watch. Keeps me motivated to keep moving, and it serves as a silent wake up alarm so I don't wake my partner in the early hours.
Honourable mentions:
A good hand-held flashlight. I use this daily for work and when I go camping. Also great at night when hunting mosquitoes in the bedroom.
A digital probe thermometer. Also used daily for work, and takes the guesswork out of cooking meats and things at home.