Cognizant interview question

Telephonic round: =============== 1) Local storage vs session storage? 2) Promises in Js 3) Let vs var vs Const 4) Prototype 5) Inline and Inline block 6) Absolute in CSS 7) media query 8) Wild card routing 9) constructor vs ngOnInit 10) Observable 11) Operators in rxjs 12) Directives 13) Connection between components 14) Authentication in routing 15) Subjects