Have you seen some results in the Google SERP stand out with some nice star ratings or even Knowledge graph?
That is Schema Markup / Structured Data.
Schema Markup is really awesome way to increase traffic, just by improving your appearance in Google SERP. It makes your website look attractive in SERP, hence improving CTR.
I find many people struggling just to find a proper Plugin for Schema Markup that suits their needs.
Here is how you can do it easily without a Plugin, So, it can be done in Blogger, WordPress, HTML or any other websites.