I have a fairly rigorous winter parking procedure, so bear with me. When I bring the bike(s) into the garage-mahal for the last ride, I turn the key off. Done.
Much to be said about adding a dollop of two-smoke oil to a full tank of gas though, as well as draining the carbs once you run a bit of the two smoke mix through. Batteries get a 2-6 hour charge via an antique Sears 6a charger every couple of months.
But if your bike sits outside, under cover, and in sub-freezing temps... Fresh oil and filter (just because), Sta-Bil (or equal) in a full fuel tank, drain the carbs, bring the battery inside, toss mice treats around the bike, on the center stand to keep the weight off the tires, toss a sheet over the bike to keep the sun off, and don't touch it until the snow melts. Leave the winter oil in until your next regularly scheduled oil change.
Do not operate heavy machinery while taking this medication, read all instructions, apply constant pressure, wear eye protection at all times, don't forget to floss.
Rick