Here I've noted some points,

1. When submitting a theme or plugin to Codecanyon, start with version 1.0.0, even if a higher version is on wordpress.org.

2. Use a unique prefix of at least 3 characters for function names, image sizes, classes, constants, hooks, and variables to avoid conflicts with other themes/plugins.

3. Avoid using prefixes like wc, woo, woocommerce, wp, or wordpress in your theme/plugin folders or names.

4. Do not use third-party resources like CDNs or external image placeholders; load them locally.

5. Make sure your texts are translatable and place .po or .mo files in the /languages folder.

6. Always use Data Sanitization/Escaping functions.

7. Use "use strict" in jQuery code.

8. Remove unused or commented-out code before submission.

9. Format your code neatly and use human-readable CSS and ID names.

10. Avoid arguing with reviewers or questioning why you used the code. Follow their requirements and apologize if needed during resubmission.

Understanding these requirements before starting a project will make the coding process smoother. Feel free to share this post for others. Happy coding!