Theres no bike-specifik thing to maintain.
I always change oil and filter, oil in forks, and regrease wheelbearings, and all the bearings in the linkage, swingarm ect.
Have a look at the chain and sprockets, see if they are near the end of their life, same with tires.
I also clean and lube every connector, and clean and oil the airfilter.
If the brakefluid is anything but golden, change it. Clean and lube the cables.
You now know everything is right, and know your way around the bike.