Is Bootstrap,Html, JavaScript,Ajax, CSS must required for any website development?

Question

Website development and designing.

If yes then rate it out of 10

Answer 1

For responsive layout, you use @media of CSS

Here are some resource about @media

1. Basic Understanding at
https://www.w3schools.com/cssref/css3_pr_mediaquery.asp

2. Pratical ways at
https://css-tricks.com/snippets/css/media-queries-for-standard-devices/

3. Full details
https://developer.mozilla.org/en-US/docs/Web/CSS/@media

Especially the browser compatibility

Answer 2

Only html, css if only display things

With javascript if want to have some logic

Bootstrap and ajax not a must.

Answer 3

Gordon for responsive layout ?