Tough choice for me, I would probably choose lynda.com if it was free .
For me its Stack Overflow
StackOverflow for me as well though I find w3schools quite useful as a reference.
I like Smashing Magazine for design and front-end scripting ideas, trends and best practices.
Unfortunately w3schools.com tends to have a lot of old, misleading, and/or inaccurate information on their site. Unfortunately they've done some dang good SEO over the years so they still come up as the #1 result for many searches for web dev tutorials and documentation. W3Fools – A W3Schools Intervention has some much better alternatives listed (e.g. MDN).
I prefer w3schools.com
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