On another note, we recently went through this same process with an entire site redesign. The executive team demanded we cut out over 75% of the pages on our site because they were useless to the visitor. It's been 60 days since the launch of the new site and I've been able to still increase rankings, long-tail keywords, and even organic traffic. It took a little bit of a "cowboy" mentality to get some simple things done (like using 301's instead of blocking the old content with robots.txt!). I predicted we would lose a lot of our long tail keywords...but we haven't....yet!
What is Search Engine Optimization (also known as SEO)? A broad definition is that search engine optimization is the art and science of making web pages attractive to search engines. More narrowly, SEO seeks to tweak particular factors known to affect search engine standing to make certain pages more attractive to search engines than other web pages that are vying for the same keywords or keyword phrases.
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.