A lot of SEO knowledge is about knowing what not to do. Don't create copies of the same content across multiple pages, and if you do, choose a canonical versio

A lot of SEO knowledge is about knowing what not to do. Don't create copies of the same content across multiple pages, and if you do, choose a canonical version. Don't exclude important directories in robots.txt, but do exclude wasteful pages like calendar pages (often there is a new page every day from Jan 1, 1970 forward). If you're a Jim's Plumbing site, you should be okay following your advice. If you're a giant site with many pages to index, you need to focus on structure. The flow of pages is important, and it's more than setting up breadcrumbs and pretty URLs. This kind of problem needs to be looked at when building a site, you can't just drop some code in after you've launched.