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Summary
Explain your changes, so people looking at the PR know what and why, the code changes are the how.
Screenshots
If you added a template to a gallery, show a screenshot of it in the gallery view (which verifies its shows up where you expected).
It is also good to show a screenshot of template content, so people can see what you expect it to look like, compared to what they see when they might run it themselves.
Validation
Validate your changes using one or more of the testing methods.
Make sure you've tested your template content. Fixing things while in PR is trivial. Hotfixing it later is very expensive; at the current time at least 3 teams are involved in a hotfix!
Checklist
When done correctly, this means that from then on your team does reviews of your things, not the workbooks team.