SEO process has three major parts Crawlabilty, Content and Links. If a spider can’t access your content then your content will not get indexed and so will never be found on search engines, that’s why crawlability is the basic and most important component of
SEO.
These crawlabilty issues includes:
* Screwing up Robots.txt file.
* Too many variables or parameters in your URLs
* Session ID’s in your URL’s
* Your site suffers from code bloat
* Your navigation and internal linking