Learning the bowline, trucker's hitch, and double half-hitches will get you the most value for your time in my opinion. They're all I've ever needed for moving or camping.
Figure eight! Learned it recently to tow a canoe. I was always towing them with a two half-hitch and trucker’s hitch. I think I like the double figure eighth to attach to the car better than two half hitch.
Taut-line hitch or Tarbuck is my go-to. Use it half the time, the double half-hitch the other half.