Challenge:
Wow, your company has decided to go ahead with Sitecore, and they purchased license and asked you to do some magic with it! It’s obvious you will be confused that from where should I start? What to look at first? what to look at last? No worries this post is for you!
Solution:
You should follow following links:
Nice post by John West on “How to Evaluate Sitecore as a Developer” http://www.sitecore.net/en/Community/Technical-Blogs/John-West-Sitecore-Blog/Posts/2010/11/How-to-Evaluate-Sitecore-as-a-Developer.aspx [Hats off to John! for writing excellent article! – Really worth to read and follow!]
Some of my favorite links!
http://learnsitecore.cmsuniverse.net/
http://learnsitecore.cmsuniverse.net/en/Developers/Articles/2009/07/SimpleSitePart1.aspx
http://learnsitecore.cmsuniverse.net/en/Developers/Articles/2009/06/ProgramaticallyItems.aspx
http://learnsitecore.cmsuniverse.net/en/Developers/Articles/2009/06/ProgramaticallyItems2.aspx
http://sdn.sitecore.net/Developer/Developers%20Cookbook.aspx
http://sdn.sitecore.net/Reference/Sitecore%206.aspx
http://sdn.sitecore.net/Articles.aspx
http://sdn.sitecore.net/FAQ.aspx
http://sdn.sitecore.net/Snippets.aspx
Happy Sitecoring! 🙂
Sitecore basics! 
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Honestly if a company wants to keep up with the times, using ASP or PHP makes about as much sense as buying a Discman. Lookup MeteorJS and forget these horrible things ever happened.