Here is an introduction. Or nothing. Something short.
Puzzle
Here is the main puzzle. How puzzling it is. This must be the first section.
Help
Hint
Here is a hint, perhaps
Solution
Here is a solution, or not
Variations
Maybe some variations on the puzzle. This section could be above "Help."
See also
or
Similar puzzles
Should come last, unless there is a section for
Puzzle source/Links
Which should always be at the end?