You don’t want to “keyword stuff” and cram your core keyword and every possible variation of it into your alt attribute. In fact, if it doesn’t fit naturally into the description, don’t include your target keyword here at all. Just be sure not to skip the alt attribute, and try to give a thorough, accurate description of the image (imagine you’re describing it to someone who can’t see it – that’s what it’s there for!).
Make it as easy as possible for users to go from general content to the more specific content they want on your site. Add navigation pages when it makes sense and effectively work these into your internal link structure. Make sure all of the pages on your site are reachable through links, and that they don't require an internal "search" functionality to be found. Link to related pages, where appropriate, to allow users to discover similar content.
Think about the words that a user might search for to find a piece of your content. Users who know a lot about the topic might use different keywords in their search queries than someone who is new to the topic. For example, a long-time football fan might search for [fifa], an acronym for the Fédération Internationale de Football Association, while a new fan might use a more general query like [football playoffs]. Anticipating these differences in search behavior and accounting for them while writing your content (using a good mix of keyword phrases) could produce positive results. Google Ads provides a handy Keyword Planner34 that helps you discover new keyword variations and see the approximate search volume for each keyword. Also, Google Search Console provides you with the top search queries your site appears for and the ones that led the most users to your site in the Performance Report35.
Keywords research is a very important process for search engine optimization as it can tell you the exact phrases people are using to search on Google. Whenever you write a new blog post, you have to check the most popular keywords, but don’t be obsessed by the search volume. Sometimes, long tail keywords are more valuable, and you can rank for them more easily.
Obviously that doesn’t make any sense, as no tool developer would have the capabilities to deliver actual LSI keyword research. Something like LSI optimization does not exist. Even Google using LSI in it’s algorithm is pure speculation. Anyone who makes such claims should take a long hard look at the LSI tutorial by Dr. E Garcia (and then stop making those claims, obviously). This is the only part I can find: http://www.360doc.com/content/13/1124/04/9482_331692838.shtml
The actual content of your page itself is, of course, very important. Different types of pages will have different “jobs” – your cornerstone content asset that you want lots of folks to link to needs to be very different than your support content that you want to make sure your users find and get an answer from quickly. That said, Google has been increasingly favoring certain types of content, and as you build out any of the pages on your site, there are a few things to keep in mind: