Build your own blog, market it (I'm doing it now). I think the important thing is to build trust and help people. The important thing is SEO, and there are people who are really expert at it (not me though
).
Website flipping (again, SEO skill needed).
Invest in a well established website. Maybe you can buy a website for ~5000$ that get 500$/month with potential growth. Check Flippa and stuff (but don't get scammed).
Freelance (writing, programming, design). Nowadays, you can learn programming online with some motivation ! Writing is a little saturated but still possible.
You can check Pat Flynn's website. He seems very honest and he made a killing at doing business online.
http://www.smartpassiveincome.com/I've heard some people are freelancing + outsourcing. Like you have a skill in programming, ok but you don't have time for the next contract. You can outsource the thing to Bangladesh and still make a profit (you'll need to review the code and supervise).
Oh I forget the "dropshipping" thing, the games "reskinning" as well. I think that's all I know.
If you're interested in investing in legit businesses you can check my website :
http://InvestBitcoinGuide.com