Google Has No Preference Between Text Links & Image Links
Google has adapted to handle all sorts of different organic links, and doesn’t see text links as better than image links.
Google Has an Upper Limit of Around 5,000 Internal Links Per Page For Crawling
Sites don’t normally exceed Google’s upper crawl limit for links on a page as it is quite high at around 5,000 links per page. However, John recommends only having necessary internal links so PageRank isn’t diluted too much.
Focus on Internal Linking Rather Than URL Structure For Passing Signals
John recommends focusing more on how pages are connected within a website through site architecture and internal linking and how easy it is for Google to find and pass signals through them, rather than worrying about the URL structure.
Cross-link Pages to Help Ensure Google Can Discover Them to Decrease Reliance on Pagination
Focusing on improving internal linking across product and blog post pages is a good strategy for ensuring Google is able to find these pages on your site rather than relying on pagination.
Google Picks Link With Most Relevant Anchor Text to Understand Context With Multiple Internal Links to Same Page
When Google detects pages with multiple internal links to the same target page, it tries to pick the link which has the most relevant anchor text to understand the context.
Anchor Text is Used as a Ranking Signal to Understand Link Context
Google uses anchor text as a ranking signal to help understand the context of a link. John recommends implementing more useful anchor text which provides more meaningful information than "click here".
Internally Linked Parameter URLs Might be Indexed Even if Canonical Points to Clean Version
When using parameter URLs for internal linking, it isn’t always guaranteed that the clean version of the URL be indexed if there is a canonical tag to this version. This is because Google has to weigh up which URL should be shown in search.
Internally Link to Seasonal Content so Google Will Index It
Publish seasonal content far enough in advance for Google to index it for the required period, and also internally link to this content so Google knows these pages are important and relevant to users which will improve indexing.