Is there a one stop shop for all web design code?

The best one-stop shopping is Google. In otherwords ‘No’.

A lot of that depends on what platform you are using?
Java vs .NET vs. ... will yield different sets of tools and tricks on different sites.

While it won’t have a lot of “beginner” stuff, I strongly recommend keeping an eye on SmashingMagazine.com

Ok, I’m familiar with Smashing Magazine. thanks.

I’ve learned xhtml (strict), css, and dreamweaver….Does javascript work similarly?
For example: Can I simply copy and paste the code into my xhtml without adding anything into my css? How does that work?

XHTML is for structure of the page
CSS is for styling
Javascript is a browser-side scripting language for some more interactive functionality.
Dreamweaver is just a software too for helping you put pieces together.
There are also server-side programming languages like PHP

If you are talking an authoritative source on what HTML, XHTML, XML and CSS are, how they should be written, what rules govern the; then the W3C is the governing standards body.

It’s specs are written in language that would not be easilly accessible for those without a background in programming, however.

For explanations about how you marry things like JavaScript with XHTML and CSS, a good resource is http://www.webdeveloper.com/

When you get into the alphabet soup of back end languages, scripting languages, development platforms and the like, there is not one-stop shop. Google’s as close as you get. :-)

@Markyjean I’ve seen that coment verbatim now as an answer to two separate questions. The referenced link seems to be a domain name registrar. How do they facilitate designing your own site. What is the URL of your site, so we can see what their tools enabled you to do.