You're not going to like my answer.
First, you can get an general overview of maintenance items here:
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Primarily, you're checking, belts, seat bolt torque, fluid levels and conditions, brake pad thickness, and changing all the fluids when needed: brake, power steering, coolant, engine oil, transmission fluid.
But if you're serious about keeping up your car - and my opinion is the reason most people need to trade in or sell their cars is that they let mechanics work on them. It is so rare to find a mechanic that would take the time to do the work as carefully and thoroughly as a conscientious owner. When I do my own work, I'm able to take the labor savings, and go ahead and replace all the necessary associated parts. Anyway, if you're serious about keeping up the car long term, you need to buy the Toyota factory service manual set. Even if it costs a couple hundred dollars, you're going to recover that cost virtually the first time you use it - especially if you buy or obtain the competitive pricing for parts over the Internet. For example, recently I had to replace brake calipers, and the dealer quoted $525, whereas I was able to buy the genuine Toyota parts for $59.90 ea. I wonder if the professional mechanics would have taken apart the torque plate, cleaned the bores with solvent and replaced with new the slide pins and dust boots, then applied synthetic grease - yet that makes all the difference in equalizing brake pad wear and improving braking efficiency. I suspect not, because when I had mentioned to him the pads had been wearing unevenly for quite some time (prior owner had brakes replaced by the dealer) the mechanic said "they all do that."