Javascript tips: include links to good js guides

[josephjclark]

The Javascript Tips page should include a little preamble about JavaScript, with a few good links to basic Javascript Resources.

It's not our job to teach people JS - but maybe we can at least point beginners in the right direction.

It's been a long time since I learned JavaScript, so tips on good guides would be appreciated.

I'd prefer a short and highly curated list here, with maybe one series of video tutorials, a couple of links to free guides, and maybe one link to an online course.

Oh and we should definitely link to MDN as the definitive reference.