To rank higher in Google, you will need links pointing to your sites. That’s a given.
These are 100% White-Hat backlinks naturally weaved into existing content on aged relevant pages or posts. From a performance point of view, because the content is aged over numerous months/years, I found that Google’s algorithm tends to give greater strength to the outbound link. Trust me, they can be even more "powerful" than fresh guest posts.
How it works: I go out and find an existing blog post that is already indexed by Google and I reach out to the blog owner to get your link placed within the content and often edit the text to make sure it blends well. I'll do my best to find topically related sites/posts, but I can't guarantee that every site will be closely related to your niche!
IMPORTANT: The Domain Authority (DA) and Page Authority (PA) of the posts will vary, but typically BOTH will range from 10 to 30.