What types of backlinks are the most effective?
Do-follow: Do-follow backlinks tell search engines to follow the link and index the page it points to. These are the most valuable type of backlinks for SEO because they can help to improve your website's domain authority and search engine rankings.
From high-quality websites: Backlinks from high-quality websites are more valuable than backlinks from low-quality websites. Search engines consider the quality of the linking website when determining the value of a backlink.