Basically the same as any motorcycle maintenance. First buy a shop manual for your specific model. It will tell you all of the maintenance schedules, specs, prcedures, fluid capacities, etc. Basic ones are tire pressure, cable adjustments and lube, belt or chain tension. (lube if chain) Check oil levels, brake fluid, lube pivot points, check air cleaner, etc..
Harleys are pretty much idiot proof. Change the oil often, but the older ones were self draining (leak all over). Also replace the spark plugs each year and adjust the valves. That's about it.
If you have aluminum on your bike it's going to eventually have to be polished. Baby wipes are good for getting the initial grime off of the bike. An old tee shirt makes for the best polishing cloth.