Internal links can boost your page authority and rankings in several ways:

- They help Google find, index and understand all of the pages on your site. By creating a clear and logical site structure with internal links, you can help Google crawl and index your pages more efficiently¹².
- They help spread link equity (also known as PageRank) to important pages. When you link from high-authority pages to pages that you want to rank, you can transfer some of that authority and improve their chances of ranking higher¹².
- They help establish information hierarchy and relevance for your site. By using internal links to create silos, pyramids, or clusters of related pages, you can show Google which pages are the most important and relevant for your site's topic²³.
- They help improve the user experience and engagement. By using internal links to provide additional resources and information to your users, you can increase their dwell time, reduce bounce rate, and encourage them to explore more of your site²⁴.

To use internal links effectively, you should follow these best practices:

- Use descriptive and relevant keywords in your anchor text that match the topic of the linked page¹².
- Diversify your anchor text with different variations of your target keywords or phrases, such as synonyms, partial matches, or related terms¹².
- Link to important and relevant pages on your site that can help users and search engines understand your site's structure and hierarchy¹².
- Audit your internal links with tools like Google Search Console or Semrush to find and fix broken links, redirects, or orphan pages¹².
- Don't use too many internal links per page, as this can dilute their value and confuse the user and the search engine²⁵.

By following these tips, you can use internal links to boost your page authority and rankings for SEO success.

Source: 
(1) What Is Internal Linking + 9 Internal Link Building Best Practices. https://klientboost.com/seo/internal-linking/
(2) How to Use Internal Links to Boost SEO | A Complete Guide - Setupad.com. https://setupad.com/blog/internal-links/
(3) Internal Linking for SEO: The Complete Guide - Backlinko. https://backlinko.com/hub/seo/internal-links.
(4) How to Use Internal Links to Boost SEO and the User Experience - Databox. https://databox.com/how-to-use-internal-links
(5) How to boost search rankings using only your internal linking strategy. https://searchengineland.com/how-to-boost-search-rankings-using-only-your-internal-linking-strategy-307322
(6) How to Increase Website Authority (Domain Rating) - SEO Blog by Ahrefs. https://ahrefs.com/blog/how-to-increase-website-authority/