It could be added a "What is this page" function in Help panel. If you use it, you receive a description about that page and you find out how can you contribute to it. For example, if you visit an article, you could read how can you improve it (adding sources, copyediting, extending...). If you visit a talk page, you could read about signature, Ping function, WP:NOT#FORUM, NPA (for example)... If you visit another userpage, you could read about why it is not recommended to edit the userpage, if it is not yours. If you visit your userpage, you could read what can you do with it... And so on.
Topic on Help talk:Growth/Tools/Help panel/Flow
You mean changing help links in the help panel depending on the context?
@Trizek (WMF): This is another good idea... but the general help should be always displayed. But not that I said. I proposed new box (a box means something like "Ask the Help Desk" in Help panel) in Hep Panel, that says you wow can you contribute to that page and what is the scope of the page.
So a box that explains the contact? like in "you are on a talk page; discover how it works". Interesting idea!
@Trizek (WMF): Yes. In Help Panel, a new box like "Ask the help desk / Get answers from other volunteers" and "General editing / Search for answers and read top articles". This box should say "What is this page / Ways to contribute to this page" (or something similar, like "About this page / Ways to contribute to this page". If you click on the box, you see a descriptive text about the page you are currently on, and how can you improve the page (it could be with slides, like Suggested Edits)...