There are various approaches to see the strength of a domain for link building. I even remember the old Toolbar Page Rank. Currently, many use external metrics like Domain Rank, MOZ Rank or any other 3rd party rank. These metrics mostly suck! There are better data available that come (almost) straight from Google!
I´ve been building links for small and large brands for 10 years. My link building mindset: provide a value first, get the link after.
I was one of the speakers on Monday in Bratislava (SK), where a 2nd edition of SEO Sraz 2020 took place.