moz.com/learn/seo/title-tag

The title tag is the single most important on-page SEO element (behind overall content). Get up-to-date SEO best practices for title tags.

top7business.com/?Top-7-Meta-Tag-Suggestions-to-Improve-Sear...

In this article, we simply talk about what Meta Tags are, their importance, the important Meta Tags and useful tips on how to optimize your Meta Tags for a better ranking with the search engines.

googlewebmastercentral.blogspot.com/2007/03/using-robots-met...

This is a basic reference for using the robots META tags

www.davecain.co.uk/blog/seo-question-length-title-descriptio...

The title tag should be know longer than 66 characters and the description tag should be know longer than 140 – 160 characters.

This article gives some more background and suggestions.