Most important should always start with the simple things that don’t require opening the hood. As you mentioned change a tire; good emergency knowledge as well as to swap summer/winter. Adding to that:

Check tire pressure, including on your spare if you have one.

Change wiper blades

Properly attach a child seat

Properly attach a roof rack or bike rack

Know how to properly/safely jump start a vehicle

Check/change fuses

Change bulbs (if accessible on your model), o.k. so that might require lifting the hood, so while you are in there top up the blinker fluid.

Basically stuff that falls under RTFM...