>> I tried reading their source code, also of atom, brackets, light table etc. Honestly I don't understand anything. I am not able to make sense of the data flo

>> I tried reading their source code, also of atom, brackets, light table etc. Honestly I don't understand anything. I am not able to make sense of the data flow and the architecture. Even so, this is exactly the right thing to do, except probably you are studying editors that are too big for your purposes - find something smaller in scope. You won't understand without significant effort - you need to put in the work. So, here's what I suggest: 1: keep examining the source code of various editors - however, focus on trying to find small editors that are very focused in what they do. Also look for old editors for operating systems like DOS - they might be smaller in scope and therefore easier to understand. Also look at editors in other languages, such as Pascal. 2: The essence of learning is to implement - so start writing the smallest editor you can. 3: continue searching for and reading any sort of written documentation/blog posts/articles as you are doing. Eventually the light will switch on.