TL;DR Rails isn't difficult to learn, but you must have rock solid knowledge of OOP Rails has been created to be easy to use / up and running without much effort. The problem here (IMHO) is that you should start using a framework only after having learnt how to program without it. Spend some time learning how OOP (Object-Oriented Programming) works. Write down some plain Ruby code and experiment how Ruby works (use IRB from Terminal) Some good starting points: To learn Ruby: https://www.ruby-lang.org/en/documentation/ To learn Rails: http://guides.rubyonrails.org/

Simply because you are asking an Object to respond to that method with an assertion true | false. Is a smart notation to distinguish this kind of methods from others that return non boolean Objects

The art of Googling is a really dangerous one. Start by understanding the problem, then read the official documentation of the tool / framework / APIs you are using (if present). If none of the previous tips worked try Googling for your issue, you'll be redirected in 99.9% of the cases to StackOverflow and you'll probably start copy / pasting the most up-voted answer. Mind that random code could probably mess up your app. TL;DR Start googling if you really can't find the right path on your own.

$ has some special meaning in jQuery, not in vanilla JS If you prepend $ to variable name it means that the specific variable will contain a jQuery Object.

I think that the real strong value in changing between companies during early stages consists in earning skills in different contexts and technologies.. As cons I can point out loosing vertical / deep knowledge around specific programming languages that you can only achieve by using them for years.