I am looking to construct web pages in a way that search engines will crawl it best.

I understand the basic tagging and on page SEO keyword related material.

I am looking for something more in the way the code is constructed or possible commands that can be given from the server or from more advanced programming so that pages can be crawled the best.

Any links, references, guidelines, articles, and subjects on what I am looking for would be very helpful and very much appreciated.