Aurelia is pretty fun to use. Check it out aurelia.io

I wouldn't say "most", necessarily. It depends on who you are talking about. For Indie devs, I would say it's probably a tossup between Unity and UE4. Many companies have their own engines they use.

My needs as a developer + the current state of chromebooks tells me no, but the possibility gets closer and closer every time I turn around. Reasons why not: Even though I utilize the cloud every day, I still like having larger storage for local files. The inability to test (locally) on multiple browsers is unfortunate and not likely to ever happen. I like using VSCode and Atom. I develop for some game specific platforms that only run on Windows. I use a Surface Pro 3 which satisfies all of the above and much more in a very comfortable and portable package. Still I voted "I can't say" because chromebooks are getting more awesome all the time. I think something along the lines of a chromebook version of Pixel C or the Pixel itself getting to a better price range with some more advancements in Chrome OS and I might change my mind.

@Jandrell - I've built single page web apps using php, but you need to use a different mind set. For one, I only used it on the server for fetching something from the database and then sending a json response to my angular front end. I was pleasantly surprised at how little php I had written and had a full blown single page application. It's not something I would do now, just something I did for the experience.

If you want to learn node, build something in node. It doesn't matter which language or which framework you use when generally speaking. When you get more specific about the product you wish to build, then you will be able to determine which languages and which frameworks/libraries you should go with.

The startup/individual plans will be added later. The current plans are aimed at large companies or corporations. Similar to the more expensive Heroku plans.