Search Console Backlinks Include Nofollowed Links
Google includes nofollowed links in the Search Console backlinks data to discourage a focus on followed links, and help you understand which content is generating the most links.
Don’t Disallow a Migrated Domain
If you disallow a migrated domain, Google can’t follow any of redirects, so backlink authority cannot be passed on.
Google Resets A Site’s Backlink Profile If The Content Changes Completely
Google can recognise when a new site is hosted on an old domain and ignore any older links to the site before it changed.
Backlinks are reported in Search Console on the canonical domains
If you canonicalise domain variants (www/non-www/http/https), all of the backlinks will be reported in Search Console under the canonical domain.
Links to 404 Pages Don’t Influence Penguin
If you 404 a page, all links into the page are dropped from the link graph, and won’t impact Penguin algorithm.
Penguin Ignores Most Links so Only Very Bad Profiles Incur a Penalty
Only sites with very bad backlink profiles are likely to see any penalty. Penguin is now mostly ignoring links rather than applying any penalty.
Location and Language Don’t Affect Backlinks
The weight of backlinks isn’t affected by the location or language of the website.
Google Penguin Devalues Links Instead of Penalising Them
The new algorithm in Penguin devalues spammy links instead of applying a penalty. Despite this, John says getting rid of disavow completely would be a bad strategy, as you can use the disavow file for any links you do not want to be associated with.
Canonicals on Shared Content to the Original Source Consolidate Authority
Canonical on Shared Content Should consolidate backlink authority on the original.