First Scripting Language for Web

I want to get off my mind of C and ((Scheme)) for a while and learn a scripting language for the web. My professor asked me if I could do a Javascript job for him and I said, I'd have to learn it first.

I want to learn Javascript or CoffeeScript but since the latter is simply a transcompiler for the other, should I learn Javascript first before getting to Coffeescript? I heard Coffeescript often makes more optimized code than Javascript, what if I just learn Coffeescript and submit the transcompiled code to my professor?

>>24,25
Can you give me a better explanation of why w3schools is evil/wrong/shouldn't exist/etc. than those links do? So far, the reasons I've seen are:

- ``Their name implies a false association with W3C that doesn't exist.'' (This is a good reason)
- ``Their information is wrong.'' I haven't actually seen any examples of this, it's just restated as a thing everyone knows.
- ``Their information is old.'' I don't get this. Are they advocating deprecated tags and falsely labelling them as part of a later version? The thing with a multi-versioned standard like HTML is that the older stuff is generally better supported, so as a beginner I'd prefer learning old, supported stuff over new, possibly-unstable stuff.
- ``They don't give much focus to HTML5.'' I don't see what's wrong with this, why would you give beginners lessons in something that is in constant flux?