A content gap is a missing piece of information or a topic that your audience is searching for, but you haven't covered yet. It often refers to topics your competitors are ranking for that you aren't.
Look at your competitor's "Most Popular" videos or blog posts. Check their comments section for questions they didn't answer. Use Google's "People Also Ask" feature to see what related questions are being searched.
No. Prioritize gaps that have high search volume and low competition, or gaps that directly lead to your product/service. Focus on gaps where you have a unique or better perspective than the competitor.