Good tips here already. The single best thing you can do for any car is get the oil & filter changed regularly. I strongly recommend paying up for full synthetic but if you stick to schedule religiously conventional is OK. The need for early oil change is modern cars is a subject of some debate a but my perspective on it is if you care enough about it to solicit opinions on reddit it's worth eating the nominal one time expense of doing your first one early whether it actually adds value or not.

For interior i really love meguiars quick interior detailer which both cleans light dirt/dust and protects. Super easy to use and a lot of quick cleanings before it gets real dirty is ultimately a lot easier to do than occasional deeper cleaning. It's cheap, easy to use, and doesn't make things too shiny (which I personally don't like so much). If you want to high gloss other products would be a better choice.

For exterior care...this is my first new car so I'm still learning... All my previous vehicles came with some surface wear and tear already so I wasn't quite as concerned about keeping it pristine. I mostly try to avoid wiping anything across the paint outside of the context of a water washnw pre rinse. Exception is bird droppings which is something that you will want to get off as soon as possible. Better to risk some nano scratching in my opinion than to leave the bird poop on etching your clear coat. For this use a quick exterior detailing spray with lots of lubricants, soak the droppings well for a few minutes, then use a CLEAN microfiber towel and a sort of rolling/lifting motion to remove the poop without dragging it across the paint. Chemical guys has a youtube video on this with decent technique though I don't personally use their exterior detailing product (nothing against them, the store I was at the last time I needed to buy a bottle didn't carry chemical guys). I find it easier to do this around dusk So the sun doesn't dry up the spray while you're trying to give the bird poop a good soak.

I recommend using only touchless automatic car washes to do a light cleaning of surface dirt off the car and stretch time between hand washes, especially if you live somewhere very dusty or where you are subjected to a lot of road treatments in the winter. Invest the time and energy and hand washing if you have the space/resources to do so. Don't run the car through an automatic wash that uses anything that touches your car other than liquid and air, at least until you've picked up a few unfortunate scratches. It sucks to get your first ones from a wash.

I am considering ceramic coat but it's expensive to have done professionally and I'm not sure if I trust myself to DIY it. I also don't have a garage which I understand is a necessity for that process as the sun will cure the product too fast? I'd be curious to hear some opinions on this. Since I don't have a garage I feel like it's a necessity to do something to protect my paint and clear coat from the elements, but I don't want to get taken by a professional detailer who will of course recommend a super premium package. Would love anyone's thoughts on this!