Internal anchor text matters a lot

"The anchor text used in internal links helps Google understand what the target page is about."

TRUE - Internal anchor text is a confirmed ranking signal. Google uses anchor text to understand the topic of linked pages. Using descriptive, relevant anchor text for internal links helps Google (and users) understand what they'll find. Don't over-optimize with exact match everywhere, but be descriptive rather than using 'click here' or 'read more'.