I've been trying to get better SEO for a while.  One of the tools I've been trying has suggested, You must also build backlinks to your site's internal pages to help Google bots crawl and index your web pages.There are links on the front page to other pages in the site.  None of the information I can find really explains what those links actually are, what they look like in a page.If it helps to answer the question, I do have an updated sitemap thats updated about once a week, it gets resubmitted at least twice a month.  The urls in the site are friendly urls.
What exactly are backlinks to inner pages?
seo;backlinks
Backlinks to inner pages are link from external websites (e.g. not your website) that link to pages that are not your homepage. The reason why this is good is because search engines rank individual web pages, not websites. And links from external websites are an important part of Google's, and probably other, search engines' ranking algorithm. So by getting external backlinks to your inner pages helps them to rank well. This is a good thing since the more pages you have that rank well for relevant search terms the more traffic your website will get. Also, because internal pages contain your actual content, users will be more likely to find the content they are looking for. This means more potential pages views, etc.