Link Interjection or Money Site Niche Relevant [?]

Can someone please explain to me how important link injection is?

Do I literally create a PBN domain about it's previous topic let's say dogs (titles - metas - alts)?
Then have an article that has to do with dogs AND my money site niche (could be phones) in order to link it up?

So I would write an article where theres a gps device on phones to locate your dog.

So my final question is, is link injection essential and why do people do it? Is it to be natural OR it gives more juice?

Hi,

I think I know what you're talking about but not totally clear. You're wondering if when you buy a domain for a PBN, do you recreate the old site based on what it used to be about and how do you go about linking it to your money site. You can do it however you want, but I would suggest the following

1) Try to buy domains *mildly* relevant. IF your niche is Huawei phones, it doesn't have to be phone related. Anything slightly technical/electronic related.
2) If you're going to go to the effort of recreating them for your PBN, you might as well go to the effort of hiding your link. A custom article is a nice way.
3) I believe it only happens to look natural. Passing a manual review. As far as I know there is no link juice benefit to that.

Thank you, I will just hide my links. Theres literally nothing I can do to make sure I pass a review. lols