That’s exactly what this is, great minds think alike! 
It’s not just for beginners though. There’s a mix of advanced stuff in here too.
That would require forum developer customization and is not doable for mods, though you’re welcome to email the suggestion to [email protected], as he’s one of the owners, and in charge of the software.
This is pinned in in the General category… however, once you’ve read it Discourse tends to unpin it for you, and you have to click the pin icon to get it back to the top again. There’s info about that in the topic.