LSI SEO, i.e Latent Semantic Indexing, is answer of search engine(Google) to regular keyword stuffing of many spammy websites in the world. Webpage are crawled by a search engine and the most common words and phrases are collected, combined and identified as the keywords for the page. In LSI approach, search engine not only uses meta tags and keywords appear several times, but it also looks for synonyms related to a particular word, and assign it as your webpage keyword and rank it higher than other sites competing for the same keyword.
Below are some tips to remember while doing LSI SEO:
The title of webpage is Car racing Games, it means your website must be about car racing games.
Never use excessive keywords since it leads to your website marked as spam.
Always use quality and unique content on your site.
Article spinning is not a good practice. Do away from that. If you have no idea about article spinning, ignore it anyway