Learn Javascript!!! Get Jobs!!!

There is not much you cannot do with JavaScript — especially when you mix it with other technologies like Canvas or SVG. However, with great power comes great responsibility, and you should always remember the following when using JavaScript.
• JavaScript might not be available — this is easy to test for so not really a problem. Things that depend on JavaScript should be created with this in mind however, and you should be careful that your site does not break (ie essential functionality is not available) if JavaScript is not available.
• If the use of JavaScript does not aid the user in reaching a goal more quickly and efficiently you are probably using it wrong.
• Using JavaScript we often break conventions that people have got used to over the years of using the web (for example clicking links to go to other pages, or a little basket icon meaning “shopping cart”). Whilst these usage patterns might be outdated and inefficient, changing them still means making users change their ways — and this makes humans feel uneasy. We like being in control and once we understand something, it is hard for us to deal with change. Your JavaScript solutions should feel naturally better than the previous interaction, but not so different that the user cannot relate to it via their previous experience. If you manage to get a site visitor saying “ah ha — this means I don’t have to wait” or “Cool — now I don’t have to take this extra annoying step”— you have got yourself a great use for JavaScript.
• JavaScript should never be a security measure. If you need to prevent users from accessing data or you are likely to handle sensitive data then don’t rely on JavaScript. Any JavaScript protection can easily be reverse engineered and overcome, as all the code is available to read on the client machine. Also, users can just turn JavaScript off in their browsers.