top profitable niche

I have read a lot of posts saying that the most profitable niches are, Health, Tech... https://www.blackhatworld.com/seo/most-profitable-niches.1139537/ It's kinda hard to believe that it's possible to make money from these niches since there are a lot of competition. What do you guys think...

Top 10 Best Selling, High Paying Niches To Follow. 1. Fitness and Weight Loss 2. Health 3. Dating and Relationships 4. Pets 5. Self-Improvement 6. Wealth Building Through Investing 7. Make Money on the Internet 8. Beauty Treatments 9. Gadgets and Technology 10. Personal Finance Here...