You're mentioning HTML so it seems that you're more into web. I'd recommend: Python, Ruby and Javascript. Some would say Python or Ruby. I suggest both. Once y

You're mentioning HTML so it seems that you're more into web. I'd recommend: Python, Ruby and Javascript. Some would say Python or Ruby. I suggest both. Once you learn one, it's very easy to pick up the other. As much as their similar, their library support and tools make them useful for different purposes as much as the same purposes. To go into a little detail, if you're building a website with some offline or non-web aspects, go with Python. If what you want to build is entirely on the web, go with Ruby on Rails / Sinatra. With these skills, you can build awesome web apps and tap into the huge library support of Python for non-web related issues. Finally, you just have to learn Javascript if you want to dive into web. Start with pure Javascript, some jQuery and pick a library (Backbone, Ember etc...) and learn it.