1)Fragment, 2)difference between react and angular, 3)diff between usecallback and use memo, 4)react architecture, 5)redux storage vs context, 6)if u on form page u filled half page and u are going to switch the page ..then u have to show the alert popup saying that u haven't finished the form how u will do 7)how u will implement session timeout and how u will show the popup 8)learn abt unit test cases jest and coverage 9)css onhover property 10) stateless and stateful components 11)useref 12) custom hooks 13) custom events