Search engine spiders can only spider through text. They will use the content on your site to determine what your site is about, which in turn will help to decide how highly your site will be ranked for specific keyword phrases when visitors type them into the search engines. For this reason, keyword research is critical to obtaining natural search engine placement and should be at the top of your list when mapping out your SEO strategy.
Hey Ted, thanks for the great questions! The peak times refer to your particular time zone, if you are targeting an audience that resides in the same zone as you. You can also use tools to find out when most of your audience is online. For example, Facebook has this built into their Page Insights. For Twitter, you can use https://followerwonk.com/. Many social posting tools also offer this functionality.