The Content Requests and Feedback forum is the best place to go if you want to request new content to be covered on KA, or have feedback on the existing content (videos, articles, and exercises).
This forum is read by the KA team responsible for making new content (internally known as... the Content Team), and they love hearing from the people who use it, including how it could be made better! :-D
Note: To be MOST effective at this - try searching to see if someone has already posted your idea for new content before starting a new post. If you find it - upvote it (pressing the ^ arrow to the left of the post), and comment! This will help promote this conversation within the forum, so when the team is gathering info on what potential ideas to work on next, they'll easily be able to find the most popular ones, as voted on by you. If you do post a new topic, be as descriptive as possible in your topic title so that people will be able to find it - otherwise, it may get edited for better clarity.
**If you have feedback on the general site functionality or layout, the Feature Requests and Site Feedback section is the best place for it. If it's about the Computer Science or Programming, then the Computing Platform section is the most appropriate.
**If there's a technical issue with the site, please post in the Technical Issues & Workarounds forum! Is there's a mistake in an exercise, video, or article, please report that directly on the piece of content in question.
**All posts in these forums should adhere to the Khan Academy Community Guidelines.