I would recommend you to stick to link building Backlinks. When you do have good backlinks pointing to your site, you get the higher chance of getting unlimited traffic or even sales to whatever product you are promoting. You can start building links without spending any dime by doing it manually.
Here are some of the ways you can generate backlinks manually.
- Forum Signature
- Facebook groups
- watermarking your images with your website link
- Article distribution
- Blog Commenting
- Social Bookmarking
- And many more.