However, times are changing. Google’s machine learning capabilities are evolving and with it their ability to rank sites in a way that is niche-specific. This means that dual-site testing isn’t really generalizable. If you decide to expand into new niches, you will have to retest, retest and retest which is very expensive.
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What am I to do?
Indeed, you are right to panic. But, alas, you have come to the right place. Over the last two years, me and my team of researchers have done tests on literally millions of sites, covering all sorts of niches. The primary aim: to deliver to you a course that gets you ready to get started with SEO in 2020, in any niche.
What does the course consist of?

So, since I am primarily a link builder, this will all be about links. The reason I love links is that they are SEO. Period. As our test data shows, high-quality backlinks are still the number one ranking factor for sites.

Assuming you’ve got everything else on point (On-Page etc), link building is the thing that moves the needle.
Anyway, over the course, you’ll find out, from our testing: exactly which backlinks are the most powerful; statistically, what link building methods work the best; and how to leverage backlinks to do different things, such as reputation management.

In short, you will know near enough to everything about link building.
Tbh, you should probably just watch the video at the top. Also, if you want to know what’s in each module, check out the descriptions on your right.