Each day we see lots of posts like this from newcomers.
And although there're members who dedicate their time to fixing such posts, it doesn't always help authors to learn: sometimes you see members with 300+ questions making similar mistakes.
There's also a '?' link in the upper right corner of edit area, but it's not that prominent (I've not noticed it until recently, at least).
I wonder, what can be done to educate newcomers about formatting rules? They are not that difficult, really.
One simple idea is a message you're about to create your first post, please check this formatting guide. Like the ones with have now for faq: Welcome to Q&A for ... -- check out the FAQ!.
Making formatting guide more 'visual' might help. I.e., for each 'trick' include not only example of code using it, but screenshot of its output (there's a lot of space on the right). Mentioning keyboard shortcuts might be nice too.
Perhaps, 1-minute video-guide showing 3-4 most important features? That sounds difficult, though.
Make "?" link more prominent. E.g., "editing-help".
Any suggestions for another icon for 'code sample' button? Current icon gives one no idea about its function.
Other ideas are welcome.