Dropshipping is usually a good place to start with low capital for investment. I still do dropshipping as well, just because it's something that grows on you as things progress in your knowledge base. And honestly.... every other method is the same exact way. If you are someone making a webpage and are really passionate about the topic. You eventually learn what offers people who are into the same niche as you want. While revolving your opinion based articles or even showing statistics on how this offer/product/service can benefit the end user.
I find that most methods don't work for people if they are not inclined in that interest at all. So if you see a method where you like the money being presented....... ask yourself if you really want to devote your time and brain to that project..... most people even abandon a project half way in based on another project coming along. I do this often, I spend $50-100 on a project and see it either
1. not working
2. i found something better,
3. or im clearly just not going to keep my ADHD ass focused enough to maintain this project)
It's really what you are most passionate in honestly. IF you get off messing with google's search algorithm then maybe you can specialize in SEO. If you are really into private labeling and can come up with an invention the world will want. Go with amazon. If you can't stop beating your dick to porn as you constantly get distracted by competitors pop up/content lockers. Then maybe something in that realm will work for you.
Basically what I'm getting at is the best methods that work for me is the ones I'm truly interested in. I watch peoples behaviors and learn how to grow with them along with monetizing. I run many pages, websites, etc where I dont even monetize because that's simply the way it goes to build reputation prior. Then you can actually listen, scrape emails, etc to find out what the people want. Let them comment on articles, videos, social media, etc