I learned LSI keywords are critical. I also call them secondary keywords. I think Ahrefs does a good job of showing keywords competitor pages rank for. I like to look at that then verify if the keyword is actually on the page. Forgetting secondary keywords is a huge mistake and surprisingly difficult to correct. Of course, don't force them in but don't forget them. That is my lesson of the day. Latent Semantic Indexing (LSI) keywords are terms related to the main keyword in content. They help search engines understand the context and relevance of content. Unlike direct synonyms, LSI keywords are thematically related words or phrases. They provide a broader context, helping search engines like Google to better understand the topic and meaning of the content, thus improving SEO performance. Using LSI keywords can make content more comprehensive, relevant, and potentially rank higher in search results. Cheers.