The goal here is to spread good information that will be helpful. The information can span almost any topic so long as it's of a certain educational quality. There isn't a hard rule for what will qualify or this list, but generally sources must be cite if they're quoting someone, experts in the respective field must be referenced/used as a primary source of information, and the content must be easy to understand (must be clearly audible, and have visuals if possible).
Yes! Absolutely! All links will be examined before being added to the list to make sure that they won't send users to malicious sites or otherwise cause trouble.
ABSOLUTELY! There are loads of useful sources that aren't listed yet, so if you know of any that aren't listed please create an issue or create a pull request!