Take at least one real, live class at a local college. Welding isn't the place for a 'learn it from YouTube' education. You need someone who can watch you (and who you can watch weld correctly!) and tell you what you are doing wrong and how to correct that. You won't get that from a video. Even a terrible weld will 'stick 2 pieces of metal together' (temporarily at least), but it will fail and much sooner than a correct weld will. It will look bad, besides.
There's still no substitute for real, in-person interaction in this world!
Once you have had a class or 3, then you'll be able to get more out of videos, but to start, you need a person.
Maybe, maybe not! I was lucky enough to figure out how "I" learned, when I was young, and this helped me learn more. When I read something I truly wanted to learn and had little prior knowledge on, I will read the book
at least 3 times! Usually twice in a row go try it out and then time number three. But this is what works for me. I always remember this quote from a TV legal show: Senior lawyer to junior lawyer: I NEVER ask a question in open court that I don't know the answer to! This translates for me read/watch then get assistance (Class in this case), this gives me a better road map to watch for my missing "Bits" and therefore pick them up when going over this [from the second read/or the teacher].
I feel that watching the videos will give you enough info to ask really meaningful questions to things you just aren't getting yet. Sort of seeing the Exam before hand kind of idea. Then as Mark suggests go back to your books and the video's. Remember the pre-training is for your insight not to make you the class know it all, ie: don't let it get in the way.
The local community college in my area offers both. Given your location, I'd have to think a similar thing would be available in your area. Look for programs under the "Adult Education" or "Continuing Education" sections on their websites. These classes are geared more towards what you are looking for - wanting to learn, but don't need the credits towards a degree or certification.
EDIT:
Found one for you... Welding Boot Camp
https://www.mchenry.edu/welding/index.asp
Here's a handy link that lists your area CC's for additional searching:
https://www.collegesimply.com/colleges-near/illinois/wauconda/community-colleges/
Meaningful insight for our age group, [at 43 you have already started transitioning from your youth thought processes to experience based thinking. My last thought for you is perhaps volunteer on a race team (cars, off-road etc.) this may give you access to additional equipment and various teachers.
Professional class room training can be enormously beneficial, if the teacher/instructor is knowledgeable and able to transfer this to their students. Also while laying fire to metal is the only way to get good at this remember to not pick up the bad habits we all do from time to time.
Harry