Internal linking can be tricky, and if done improperly, it can damage your site's authority and relevance, as well as frustrate your users. To ensure success, you should avoid common mistakes such as broken links, orphaned pages, and too many links. Broken links lead to non-existent or inaccessible pages, and can harm your credibility and user experience. Orphaned pages have no internal links pointing to them, making them hard to find and index. Too many links on a page can make it look cluttered and spammy, which can dilute your site's authority and relevance. To fix these issues, you should regularly check for broken links with tools like Screaming Frog or Ahrefs. Additionally, link to orphaned pages from relevant and authoritative pages with descriptive anchor texts. Finally, limit the number of links on each page based on the length and purpose of the page.