This is a question that is ask my teenager. My answer youtube.
1. create a video of something interesting. Monetize the video. It may not bring in much but its something.
2. start a blog about something. Add a google adsence account to it. the more traffic the chances of seeing an ad to click on it to make a few cents.
3. affiliate programs. add links to the blog or web site.
4. sell things on ebay
5. mow lawns, rake leaves, shovel snow