I've had great experience as a user of Udemy and write my own courses but offer those privately for my clients.
It's always better to build a course that answers a specific need. Think about the avatar for your business. You can't meet everyone's needs. Build a course with no more than 8 segments or modules with 4 - 8 learning segments within each module. You will allow the user to achieve rapid and measurable results by completing each section and ending each module with an assessment (quiz) that further validates learning the skill. Udemy is easy to use so you will have a broad audience looking for specific needs.

I am a successful Udemy course creator and producer. Udemy offers a too that can run a search on any ideas you have and give you some results that are based on the data they have collected regarding different course ideas. This tool is made for the purpose of helping creators make good decisions for courses.

You will have better success if you go specific, especially if there are other courses in that topic already. Something the above mentioned tool will tell you.

I am an expert in the Udemy Marketplace as well as other course work marketplaces and platforms and would be happy to consult you. I am sure I can help. I invite you to book some time.

Robert Lunte

Don't chase "profitable" right off the bat. Teach what you know best. If you're from a developed nation, "profit" can be a hard target.
You'll discover more as you go. Don't invest too much time and money at the beginning as well. Start with simple gear and straight forward techniques.
Online courses are created with the mindset that students learn something useful after watching every video, every section, and every course. Niche courses do better on Udemy I believe, "focus strategies for students" would sell well as compared to 'learning strategies" since the later is vague and doesn't attract a specific audience.

Udemy is fine + I've had far better sales doing my own leadgen, marketing, sales than relying on Udemy.

There are so many ways to find good niches + do effective leadgen for various niches.

I'd say book hour calls with many experts + just take a deep poll of how people accomplish their leadgen, marketing, sales.

Also... very important... stick with markets where you already have affinity.

Dan Kennedy's + Bill Glazer's books will likely help with the basics.

My suggestion would definitely be to go as specific as you can. You should start by serving the minimum viable market.

Your product will not be for everybody, but it it will be for a few. If you create the course specifically for this target audience, it will be customised for them and the value for the target audience will be higher.

Think of it in that way: If you put a drop of ink in the ocean, the ocean will not turn purple. If you put a drop of ink in a swimming pool, it will change the colour. So the key is to find a swimming pool first. Then scale up later.

Very crucial for your success on Udemy is the quality of your course. You are facing quite some competition on this platform. Make sure your intro videos are very appealing and you are highlighting the benefits for your students in a clear way.

If you want to know more, please feel free to schedule a call.

Cheers and have a good evening

Hello Otatade Okojie here Marketing and sales will always be a profitable niche because they are relevant, they are key and in consistent demand. A marketing course on udemy with bitesized manageable and animated syllabus engaging content, illustrations, including one with sales , some data, and some analytic, how to strategy tips, and ideas, pitch ideas, how to turn around rejection ideas, how to close ideas, how to Monetise products on different platforms, and work the algorithms, will always be a hot sell. Audiences love this type of content. Sales challenges them, it forces them to engage, it forces them to connect, to step outside the bracket and outside their comfort zone. Marketing teaches them how to build profile, how to be seen, how to translate content into viable commercial products for economy.Research first of all what challenges your candidate is looking for? What would you like to sell them? What courses could add value , could make an impact? Could give them more transferable skills. Could these courses give them a job that your providing, improve their sales skills, their business to business engagement, their leadership skills, their commerce skills, maybe you want to teach about branding? What impact could your course have on their finances? How could you improve their life providing more access?