Most people who want to create an online course don't have a shortage of ideas. They have too many.
There's the Excel automation thing you could teach, the freelancing stuff you know from experience, and that niche topic you've been explaining to people for years. Any of them could become a course. You've been sitting on all three for six months.
The problem isn't the ideas. It's that picking the wrong one means weeks of work for something nobody buys. This guide gives you a way to choose before you commit.
The fastest way to validate demand: search Udemy
Before anything else, go to Udemy and search for your topic. What you're looking for:
Good signs
- ✓ Multiple courses with 1,000+ ratings
- ✓ Top courses have recent reviews
- ✓ Different instructors covering the same topic
- ✓ Specific sub-topics appear in titles
Warning signs
- ✕ Fewer than 3 courses on the topic
- ✕ Top course has under 100 ratings
- ✕ Last review was 2+ years ago
- ✕ Only one instructor dominates entirely
Existing courses with thousands of students aren't competition to avoid — they're proof that people pay for this. Your job is to find the angle they haven't covered, or the audience they're not speaking to.
The filter: passion vs. experience vs. outcome
Run each of your ideas through three questions:
Have you done this and gotten a real result?
Not read about it, not studied it — done it. Made mistakes, corrected them, done it again until it worked. If yes, you have the credibility to teach it. If no, you're teaching theory, and students can tell.
Can you describe the outcome in one sentence?
"By the end of this course, students will be able to _____." If you can't finish that sentence with something specific and measurable, the topic is probably too vague to sell. 'Understand Excel better' is not an outcome. 'Build an invoice tracker that calculates tax automatically' is.
Is someone actively searching for this?
Check Google autocomplete, Reddit, and Udemy search. If people are already asking questions about it — in forums, in YouTube comments, in search — they're already willing to pay someone to teach it.
Why narrower almost always wins
The instinct when choosing a topic is to go broad — cover everything, appeal to everyone. This is almost always wrong.
A student searching Udemy for "Python" is overwhelmed by 2,000 results. A student searching for "Python for accountants who want to automate Excel reports" finds three courses and immediately knows which one is for them. Narrow topics have less competition, rank more easily, and convert better because the student immediately recognizes themselves.
Once you've picked: structure it before you record
Picking the right topic is the first decision. Structuring it well is the second — and the one that determines whether students finish the course and leave reviews.
CourseKit generates a full module-by-module curriculum from your topic and target audience in under 5 minutes. You get section titles, lesson names, and learning objectives — ready to paste into Udemy or any course builder. One-time purchase, $0.20 per generation.
Frequently asked questions
How do I know if my online course idea will sell?
Search for your topic on Udemy. If there are courses with 1,000+ reviews, people are paying for this subject. If the top results have vague titles and few reviews, the demand may not be there — or the topic is too broad to attract search traffic. Existing paid courses are proof of demand.
What online course topics make the most money?
Topics with a clear, measurable career or income outcome consistently outperform interest-based topics. Tech skills (coding, data, cloud certifications), business skills (freelancing, marketing, sales), and professional certifications tend to have high demand and willingness to pay. Hobby and creative topics can sell well too but usually require a larger existing audience.
Should I teach something I'm passionate about or something that sells?
Ideally both, but if you have to choose: teach something you've actually done and gotten results from, even if it's not your deepest passion. Passion without experience produces courses that feel inspirational but deliver little. Experience without passion produces courses that are dry but useful — and useful courses get good reviews.
Is my course topic too competitive?
Competition is usually a sign of demand, not a reason to avoid a topic. The problem isn't too much competition — it's too little differentiation. 'Python for beginners' is competitive. 'Python for Excel users who want to automate their reports' is specific enough to find its audience without competing directly with the biggest courses.
How specific should my online course topic be?
Specific enough that the target student immediately recognizes themselves in the title. 'Excel for Freelancers Who Invoice More Than 10 Clients' is more specific than necessary. 'Excel for Freelancers' is about right. 'Microsoft Excel' is too broad. The goal is specificity that narrows the audience without shrinking it to zero.