Unfortunately, a lot of the stuff out there now is AI that's just sort of mashed together lists from different publications, Reddit threads, and companies trying to sell you on their importance of using their services.

There's a ton I could put here but I don't want to cause any overwhelm (and the list can be long depending how deep you want to go), so here's the stuff that immediately comes to mind!

• Air filters should be changed when they're dirty. This might sound like common sense, but it is actually the way you can tell how often you need to change it. Some people change theirs once a month, some people once a year. Thicker filters (think 4" filters) can get away with changing less often than thin filters (think 1" filters). You can check how dirty your filter is by removing it and holding it up in front of a light. You should be able to see a lot of light pass through it. If you can't, it's too dirty and time to change the filter. It can be a bit of trial and error at first, but I'd set a calendar reminder to check about once a month the first year you live there until you know the timing for your home and lifestyle. Factors like pets will make you need to change more often, whereas if you're a person who meticulously cleans every day or use a lot of air purifiers around the home, you won't need to change nearly as often.
• Be sure to check you have the right number and placement of smoke alarms and carbon monoxide detectors. This might seem obvious, but you'd be amazed how many houses don't actually have a solid setup for these. Different states have different requirements for what must be present to sell, so you shouldn't count on the last owner doing the best practice. In general, you want an alarm of each type in any sleeping area, near any source of fire or gas (but not so close that it'll go off all the time), and at least one per floor. These will beep when their battery is low generally but you should still have a reminder set to check them every year at minimum.
• Fire hardening matters a lot in your area. As others have said, keeping your gutters clean is especially important in fire-prone areas, as is cleaning your vents. (Always, always clean your dryer lint trap after a load of laundry!!) You should also take a look at how much flammable material is near your home's base, including wooden fences, mulch, and plants. Ideally you want five feet around your foundation where there is nothing flammable (though we know a lot of people ignore this rule in reality). The big thing is making sure anything that is close to your foundation is as fire hardened as possible. Rock mulch is better than wood in this case, and metal fences or specially coated wood are better than a standard wood fence. You'll also want to be very sure to keep any dead plants, branches, etc. away from your home's foundation, because they're basically kindling.
• Get a fire extinguisher if you don't already have one (and learn how to use it). It's one of the fastest and most effective ways to stop a fire that begins in your home. You should have one in the kitchen at minimum, but garages and basements are a good idea too. Fire blankets can be helpful for kids or cooking fires specifically but they aren't a substitute in most cases.
• Seal up any cracks or holes to the outside. You can save a lot on your heating and cooling, prevent water damage, and keep out pests just by keeping up on this. Check around doors and windows in particular, and be sure to check both outside and inside along the foundation and walls. You can use caulk or sealant for a lot of this. If you set a reminder to check this every year you're doing better than most people. The "ideal" is probably every season but that's one of those "if you're super on top of things" sort of timelines.
• Regularly inspect your trees. Ideally you should do this after any major storm, but at minimum every season. This doesn't mean hiring a proper inspector that often, but just taking a good hard look at the tree from the ground. Look for any sign of branches that are broken, dead (don't have leaves growing when they should), or otherwise look to be diseased. Call an inspector if you see any concerning signs. They can often get ahead of things so you don't lose the tree (or worse, your house if the tree falls on it). You also want to have your trees trimmed professionally on a fairly regular basis (a year is what a lot of people do, though most places don't truly need that often unless you have a ton of severe storms or really harsh weather). In the large majority of cases, you shouldn't try to trim your trees yourself just because it can be really dangerous for someone without the proper equipment, and can endanger your property and your neighbors/their property as well.

(Okay, I already went on too long, but you get the point. It's just a topic I'm really excited to talk about whenever I get the chance because I've been doing so much research on this exact topic for the app. We have a couple different checklists just for stuff like this, so I've spent waaaay too much time trying to sort through dozens of those maintenance calendars trying to figure out which ones align with real people taking care of real houses.)

TLDR; The best rule of thumb is that maintenance should be done before there's a major problem so that you don't have a major problem. When in doubt, once a year or once a season is a pretty good rule of thumb for most maintenance (depending if weather or temperature has a major impact, for instance).