- what is symentic tag in html - what is use of symentic tag in application level - what is different position value in html - what is use of Doctype in html - what is use of less pre-processor - how to color evey 3rd cell of table with css only - if there is three div how it display (one down other or in same line) - and how to make them in line - what is block elements and inline elements - what is hoisting in javascript - promise and async await - what is HOC - what is use to increase proformance of react - class vs function component - state vs props - what is redux - reducer vs middleware in redux - event bubbling and event capturing in javascript