Hey, there are no stupid questions, only stupid answers, so...
Regarding your question, I will not claim that those old methods where tier 2 link has 100s of links and tier 3 has 1000s+ don't work anymore, for me personally that kind of work method has been a thing of the past since 4, 5 years ago.
Now, if we are talking about a serious link-building structure, which will really boost site authority and ranking, for t2 links use some of the non-top-tier blogs, which are still relevant and have some credibility, possibly article directories, social media posts, guest posts, etc., for t3 [link juice], commenting on blogs, bookmarking, directory submissions, cheap backlinks and some diversify links.
Just my 2 cents:
Don't build too much because Google immediately sees it as spam.
Build it in the long run, 1 to 2 links per day, no more than that, I repeat again, this is my opinion and my experience.
In the last couple of years, I've been doing better without building any links honestly than when I was building thousands and thousands...
So, yeah, content is still one of the most relevant things out there.