Stat Counter
The stat counter I mostly use is a free stat counter that gives you all the nice information such as Summary, Popular Pages, Entry Pages, Exit Pages, Came From, Keyword Analysis, Recent Keyword Activity, Recent Came From, Search Engine Wars, Exit Links, Exit Link Activity, Downloads, Download Activity, Visitor Paths, etc. You have up to 500 Log entries with the free usage and can increase that if you want with the paid option.
www.statcounter.com

W3School
This is the most important website for any new web designer. Any thing you ever want to know about website coding will be there, from html, php, web consortium rules and regulations etc.
www.w3schools.com

World Wide Web Consortium
W3C primarily pursues its mission through the creation of Web standards and guidelines. Since 1994, W3C has published more than 110 such standards, called W3C Recommendations. W3C also engages in education and outreach, develops software, and serves as an open forum for discussion about the Web. In order for the Web to reach its full potential, the most fundamental Web technologies must be compatible with one another and allow any hardware and software used to access the Web to work together. W3C refers to this goal as Web interoperability. By publishing open (non-proprietary) standards for Web languages and protocols, W3C seeks to avoid market fragmentation and thus Web fragmentation
www.w3.org