If you're looking to upload an image to a blog post, for example, examine the file for its file size first. If it's anywhere in megabyte (MB) territory, even just 1 MB, it's a good idea to use an image compression tool to reduce the file size before uploading it to your blog. Sites like TinyPNG make it easy to compress images in bulk, while Google's very own Squoosh has been known to shrink image file sizes to microscopic levels.
Laura,Great post.  This touches something I wish more SEOs practiced: conversion optimization. I think most SEOs think of what they do as a service for, instead of a partnership with clients.  The end result should never be raw traffic, but value obtained through targeted, CONVERTING traffic.You make excellent points about market research, product input, content creation, and other functions many SEOs and SEMs neglect.More and more SEO providers focus only on assembly line basics and worn out techniques instead of challenging themsleves to learn product marketing, usability, and conversion optimization.Your advice on market research is extremely valuable.Great start to a promising series.  I look forward to more!
Keep resources crawlable. Blocking page resources can give Google an incomplete picture of your website. This often happens when your robots.txt file is blocking access to some or all of your page resources. If Googlebot doesn't have access to a page's resources, such as CSS, JavaScript, or images, we may not detect that it's built to display and work well on a mobile browser. In other words, we may not detect that the page is "mobile-friendly," and therefore not properly serve it to mobile searchers.
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.