It really depends on how anal you want to be about caring for your car. Washing a car is one thing, detailing takes it to another level. I learned to properly detail a car ages ago before some of the new stuff like PPF and ceramic coating was common place. Detailing is a VERY deep rabbit hole if you really want to get obsessive about it and can be very involved if you really want to do it right - as in random-orbit polisher, clay bar, multi-layer glazes and sealants right. I've got a whole shelf of car show awards thanks to what I learned about detailing way back when.
If you want to just keep it simple though and just learn how not to eff up your paint - actually most paint issues aren't caused by problems with the paint itself but instead by people washing their cars wrong or not at all - there's plenty of resources on the internet to learn with. If you want to hand wash a car properly then you need to learn the two-bucket method and use the proper stuff. Here's a fairly simple guide for beginners:
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Here's one longish but very helpful guide if you want to detail and really make your car shine.
For most people, the act of cleaning a car feels more akin to a chore than an accomplishment. Labor intensive, time consuming, and tedious as all hell, cleaning a car top to bottom is often likened to punishment than pleasure. As with any "detail-oriented" endeavor, knowing where to start and...
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The big name brands like Meguiar's, Mother's, and Turtle Wax are a good place to start for basic supplies but if you get obsessive there's a whole universe of products out there for the dedicated car nut.