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Are "Redirect 303 & Iframe" types of backlinks? google count them?

I have website with authority 50, I put one link for a site, How much will this site take from my authority? , Will this authority minify from my website? What if I put two links to 2 website, how much everyone will take?

Whats happen if I or other didn't build any backlinks to my new website, but I still building content to my website, whats happen? and what google will do for that?

I want to know about your advice to re-life expired domain, assume PA:55 how I get benefits from it, when I use it for new related content.