I'm new with SEO. I want to start with on-page optimization as it is quick and easy to implement.
I will start with HTML structures such as
<title>, meta, headers, etc. and then set up robots.txt and sitemap. However, I will not touch up on content as we have other people (writers) to do so. Before I begin though, I want to have a benchmark of the old site so that I can measure how effective my on-page optimization is.
So what do you measure on-page optimization with and how?