Here is a list of electronic related websites that I personally recommend for people to check out if they are looking for free resources for electronic education and information.
I am not affiliated with any of these websites, they are just websites that I personally recommend.
World Radio History
https://www.worldradiohistory.com/index.htm
World Radio History is a non-profit free to access website that archives and preserves vintage electronics literature. They have a large variety of electronics literature including books and magazines. The website can be difficult to navigate, so I highly recommend having a notebook that lists where to find all the pages you are interested in. The website also has a robust search feature which is a great resource for research projects and is something I have used myself many times.
For people learning electronics I recommend going clicking on Bookshelf and then scrolling down to “Electronics Books By Publisher Collection”. There I recommend looking through the publishers and seeing what books they offer. Make sure to try to look at books published after the 1960s.
My personal recommendations are the Radio Shack, TAB Books, and SAMS Library. Look for a book on whatever topic you want to learn whether it be basic electronics, transistor electronics, or specific audio and video circuits.
A final piece of advice is don’t overwhelm yourself downloading multiple books or magazines. Keep a slow pace and try to focus on one thing at a time.