Hi, Stormy!
Believe it or not: YouTube. I went from knowing nothing more than tires & wiper blades to now I do ALL my own auto maintenance and upgrades myself. Stuff like "basic internal combustion engine anatomy" or even "how does a car engine work", at first I couldn't make sense of any of it but I kept watching and listening until the words became familiar enough for me to click into place & understand.
If you can afford one, you can buy functional scale replica models of car engines that you build yourself & add colored liquid to in order to learn how the whole thing works, they're usually clear/transparent. Hobby shops or Amazon sell them for between $45-100+
Really, what helped me tie what I was learning together was Adventure Time! There's an episode where Banana Man explains to Finn & Jake how an engine works in very simple terms, to this day it's my go-to for people starting from 0 with car engines.It confused me at first when I sae the episodebefore I had my current car, but again I kept on it until I heard enough terms enough times to start figuring out what they meant when I saw it again.
After that, I got something called a Micro Mechanic for $10 that I stuck onto my car so that any time I get a Check Engine light, I use that device to get the error code & Google what it means, then YouTube how to fix it. I learned the names of the parts that way, one at a time, by putting my hands on it and using Google/YouTube.
Another option to look into, if you have a library card see if your local branch has any automotive magazines, manuals or books you can check out either from the branch itself or from Hoopla.
As for meeting other car people, online isn't really the easiest place to make friends anymore, BUT I used to use Instagram (when I still used it) and Twitter to find local car meets which is a GREAT way to make friends into cars.
Learning how to work on my own car taught me sooo much and has saved me THOUSANDS of dollars in both repairs and upgrades. Next I'm adding a wired in cabcam/dashcam combo with motion detection and night vision, and a train horn. After that, I'm replacing the bumpers, fenders, and redoing the dials + changing the light panel colors. 3 years ago, I had *no idea* how to do anything other than air up my tires and change the wiper blades.
I've had my car for almost 7 years now & I've had a couple of times where other drivers have hit me & caused cosmetic damage, like taken off a mirror, dented the bumper and caved in a fender, but I learned how to fix all that myself. I've also replaced both headlights, the interior dome lights, the sunroof open/close rocker switch (it shorted out), had to replace the tubing for the wiper fluid bc of dryrotting (my car's a 2010, I'm the 3rd owner), several fuses (which helped me learn abt the electrical system), and I now handle all the fluids like oil changes plus coolant and transmission myself.
It's seriously become my favorite and most useful hobby & I encourage everyone to get into cars too. Most of us rely on them for work, anyway! Why not enjoy it & avoid paying a Mechanic while learning a marketable skill?? Plus you can always independently take the certification and work as a Mechanic/Mobile Mechanic for yourself for extra $$$.
Also posting questions here in the Auto forum encourages more people to do so and you might even find someone here who can help you learn!
Good luck!