If you are looking for instructions on how to use "Review" features within the Google Drive ecosystem:
: Her Episode 38 focuses on optimizing a Google Business Profile, which includes managing customer reviews—a critical component of "Google reviews". Ep 38 - Google Drive
If the "Ep 38" you're referencing was about how to leave a review for a business: If you are looking for instructions on how
: If you have editing access, you can switch from "Editing" to "Suggesting" in the top-right corner to leave tracked changes and comments for others to review. Ep 38 - Google Drive