Spell-checking

7.  If you find an error or omission in this documentation,

    please [file an issue in this repository][example-issues].

    If you find an error or omission in the lesson template,

    please [file an issue in the stles repository][styles-issues] instead.

    please [file an issue in the styles repository][styles-issues] instead.

## Layout

    there are often several different orders in which ideas can sensibly be introduced.

    It is common to discover a need for more formative assessments at this stage;

    to continue with the driving example,

    the lesson author might realize that a third exericse on turning while backing up is needed

    the lesson author might realize that a third exercise on turning while backing up is needed

    (since many people initially turn the steering wheel the wrong way when they're in reverse).

In practice, the process often looks more like this:

*   `title` is the title of your lesson,

    e.g.,

    "Defense Against the Dark Arts".

    "Defence Against the Dark Arts".

*   `repo` is the URL for your repository on GitHub *without* a trailing slash,

    e.g., `https://github.com/username/subject`.

*   `.bash`: Bash shell commands

*   `.make`: Makefiles

*   `.matlab`: MATLAB source

*   `.python`: Python source

*   `.r`: R source

*   `.sql`: SQL source

- "Run the lesson checking script and interpret its output correctly."

- "Preview a lesson locally."

keypoints:

- "Lessons are checked by runnin `make lesson-check`."

- "Lessons are checked by running `make lesson-check`."

- "The checker uses the same Markdown parser as Jekyll."

- "Lessons can be previewed by running `make serve`."

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