We have the same problem with cars... we know they need oil changes but that's it lol... I don't know why DH & I are so clueless on this, we're not dumb but it sure feels that way right now!!
If you google there are a ton of helpful lists out there... this was the first one I found and it seems really comprehensive, probably moreso than you need. But at least it's a starting point!
Mi vida loca: full-time WOHM, frugalista, foodie wannabe, 10+ years of TCOYF
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This summer (in the midst of weeks of 100* days) our A/C went out. So I had the repair guy come out and the first thing he did was remove the filter. It was horrible and we couldn't even see through it! He had to tweak a few other things because the machine had to work so hard since it wasn't getting any actual air flow, BUT he did tell me to write a note on the calendar for the first of every month to *check* the air filter. I only had to replace it if I couldn't see through it, but I HAD to check it. Very expensive lesson learned.
Chatty Girl - 3/2006, Lovey Boy - 1/2010, Delicious Baby Girl - 1/2012
I like those lists too. I don't do all the things on them...but they are still a helpful guide to get you started.
I'm with you - all the time my in laws are asking/telling us to do things around the house (and we only have an apartment, not an actual house) and my first reaction is nearly always "Crap, seriously? I had no idea you were supposed to do XYZ..." It's any wonder I manage to be a functioning adult, with an offspring, no less! :-) Hahaha, oh well.
There are also all these trendy home keeping books - Home Economics, How to Sew a Button: And Other Nifty Things Your Grandmother Knew, The First Time Homeowner's Survival Guide, etc. I always look at these in the bookstore and think about buying one, but then I don't because I figure why pay money for something I already know? Except a lot of it I don't actually already know... so my logic is totally flawed.
Apartment Farm - the chronicles of my cooking, gardening, crafting and other such things.