Thinking of what I have taken apart in the last year or so....
Printers are one of my favorites to take apart as there are normally several motors with gears that can be reused into other moving projects. Old tape players are the same.
If you can get old projectors they have some great lens on them. Often a squirrel cage fan which is hard to find now days.
Microwave ovens have a good slow motor at the bottom and a fairly decent fan in a housing. If you take the door apart you get a chunk of metal with a lot of holes that can act like a sturdy screen tray. The clear glass in the door is often in a pretty good mount that can be reused as is. There are often a few buttons that tell it when the door is closed that are useful. I have never had much luck with the touch pads on those. The thermal fuse thing can also be useful in some projects to protect them from burning up. Also the plate in the bottom that turns save the ring with the wheels and you have a poor Lazy Susan. If you have a wood working friend with a lathe the plate can be mounted up on a few wood rings the right size for a good lazy Susan.
A lot of the above have good power cords or plugs to plug on into. Also can often find interesting grommets to run wires through metal plates and misc plastic and rubber things to dampen movement and sounds. Plus a nice pile of screws and some bolts and nuts.
Power supplies from old computer towers are a classic to make a table power supplies. Heard of people doing things with the hard drives, I have yet to though.
Pretty much any tech from the 1900s will be fun to take apart and will yield a nice pile of useful parts.
The new small tech like smart phones I have had very poor luck trying to get anything useful. Heck the last one I took apart I never did find the motor that made it vibrate.
Newer car radios are also a poor one to try and get parts out of. Unless I have another radio of the same make that needs a modal they are not worth the effort, though it is an education to learn how they change the CDs in those things and you will end up with a big pile of tiny screws often including some specialty ones.
On anything you work with keep your eye open for big caps and make sure the caps have been discharged before you cross the wrong thing.