I am a newbie, I would like to know is it possible to build our own chatbot with angular and node.js? or What are all the information and technologies do i need to know to build my own customized chatbot?
To begin with you must know how does it actually work, i have written one in C# Chatbot using c# that can give you a basic idea, but proficiency in Javascript is must before you dig deep into these things.
Once you understand it you can go/learn the Artificial Intelligence Markup Language which is implemented on ALICE bot. There is also a new offering from Microsoft called Microsoft Bot Framework which can also be used with node.js.