javascrips objects classes and inheritance in js pre defined functions in js event looping mech of js, what is asyn arrow fuctions / normal function es6 features multi threading in js what is constructor am ddefault value what are classes in react-> function, class based componets in react life cycle methods depricated methods best method to call api differ between in life cycles props and state HOC how to implements and where to implement redux , context api, why redux what is mapDispatchto props, mapStatetoprops, what are the parameters are acceping in connect react router - version ? Is it posible to transfer teh data from one componets without state and props. --- react router how you will implement authenticate in reactjs Middlewares diff between thunk and saga what are the side effects, what is genarator functions error handeling part testing - tools.jest and enzyme