The Web Developer’s SEO Cheat Sheet suggests us the following:

• Important SEO Html Tags, Search Engine Indexing Limits
• Robots.txt Syntax
• 301 Redirect, Important Search Engine Robot User-Agents
• Recommended Title Tag Syntax, Common Canonical Issues
• Common Robot Traps to Avoid, Robots Meta Tag Syntax
• Sitemap Syntax

Overview of front of Web Developer’s SEO Cheat Sheet

Important SEO Html Tags

This section includes all the critical SEO HTML tags. In addition to record the tags, it furthermore allows code examples.

Search Engine Indexing Limits

This section includes all the substantial SEO HTML tags. In addition to store the tags, it moreover permits code examples.
 

Recommended Title Tag Syntax

This box includes the recommended title tag syntax. Although various excessive formats exist, such a one has provided evidence remarkably useful to SEOmoz members.

Common Canonical Issues

This covers the a good number of median canonical tribulations lendees are dealing with and offers an easy solution. 

301 Redirect

This section includes the server part code for 301 redirects on Apache. 301 redirects on IIS are setup employing the as long as GUI and therefore got not included on such cheat sheet. (Plus, I am meaningless when it comes to configuring IIS web servers.) 

Backside

Backside of the Web Developer’s SEO Cheat Sheet.

Important Search Engine Robot User-Agents

This part includes a register of all the spider user-agents of the valuable searching the web engines. The versions on the catalog ought to soon go out of date, but the record should keep useful by helping to identify oddly named spiders (Ex. IA Archiver = Ask.com) 

Common Robot Traps to Avoid

This box includes a include of the various ordinary ways advetisers unintentionally thwart spiders from what i read in crawling such a sites.

Robots Meta Tag Syntax

This section includes documentation for the robots meta tag. This includes all of the obtainable arguments as perfectly as searching engine compatibility. 

Robots.txt Syntax

A ideal of a clear robots.txt. This illustrates how to block certain robots from what i read in both whole directories and a small amount of files.

Sitemap Syntax

This section tells the standardized sitemap.xml syntax. It in addition lists the default units search engine engines watch for sitemaps. 

Source: The Web Developer’s SEO Cheat Sheet