Every academic article has a corresponding author whose email address is listed on the first page. If an article is paywalled, just send a short, polite email requesting a PDF from the author. 95% of the time you’ll receive it within a day. People like knowing their work is being read!
P.S. I usually add a sentence like “if you have other papers you think I should read, please include them.” Often an author will have more recent work related to a paper I’m requesting.
ALSO even if you do have access... you can email people to tell them their article was helpful. I've emailed some authors to be like "Hey thanks for [your article about topic] it's super clear and I use it a lot for teaching about [topic]!" The world could use more good vibes sent around.
In my field they rarely include contact details on the article itself, but it can usually be found with cursory googling and I've never had an author say no when I asked for help finding their work! Several have sent me multiple related articles when I asked for one.
Assuming that corresponding authors email address is the same as when the paper was published. I will lose access to my uni email once i have finished publishing the last of my papers now i am no longer in academia.
ResearchGate further facilitates this process. Person finds paper there, presses button to send request to author, author presses another button to send copy stored within ResearchGate to person requesting. Got many a request this way.
In my experience, most emails to authors are ignored. I assume because they don't even see them or are too busy. I just don't think people should expect a 95% success rate unless they're KOLs themselves.
When I was working on my dissertation there was an out of print book I desperately wanted. Through the grad student grapevine I learned that the author would send you a copy in exchange for a donation to a charity she supported. It was amazing.