This C# Leap Approaches has been shared as a “good example” of an approach. Or the C# Reverse String (linked from the Blog Post). I believe if you use one of those as a guide, you’ll be well off.
This can include all of the above:
general guidance about the exercise which is not specific to any one approach
I think it’s fine to include special cases to consider here, as well.
an optional “Which approach to use”
The approaches is (1) part of the introduction.md file where you include a summary of each approach along with a link to said approach. The approaches is also (2) a separate article for each approach.
The intro should have a brief summary of each approach.
The approach files should have code snippets and a deeper dive into the approach.
You can look at existing approaches (linked about) for file naming convention; each approach is another directory with a snippet.txt and content.md.
Take a look at some of the existing approaches files. That might help clarify matters. If anything is still unclear, please do ask questions!
Just a heads up (which you probably already realize) to be sure to check if a Dig Deeper for an exercise has already been PR’d before starting one. I mention it because the Go track has about a dozen or so waiting for the maintainers to come off their holiday break.