As mentioned in chapter three, you need to link internal pages that have the same theme together. Google does not bother with all the links, but it does pay attention to how you use them. After you optimize the pages on your website, decide how you want to link to them. There are guidelines you can follow. Relevance and theme are the most crucial factors here. If you lay down your internal links thematically, it positively influences your ranking on Google.
Linking from your main content is advisable. Know that links placed higher up and on the first few paragraphs are more valuable than links mentioned below. Again, diversify your anchor text, but keep the keywords relevant. Use this knowledge to your advantage and do not use links haphazardly. Create content around it for the users to understand the context.