I was the only speaker in this event, subjects were many and related to each other such as Scaleble Web Apps, React vs Angular2, Relay, Redux, GraphQL, RestAPI and CRUD Opearations. I started speaking from single page applications(SPA) and non-SPA applications.Then we investigated advatages and disadvantages of SPA approach and major SPA libraries/frameworks. Then React.Js has chosen hypothetically due to reasons that same as big companies have.