Website layout sizes in 2021?

Question

Design

What size should the layout be? Tell me the correct width... Also, what height should the header and blocks be?
And tell me, do you need indents if the layout is 1920 wide? I mean, do you need to back up everything, or do you need to retreat?

I just study this business, attend courses and watch various training videos, read about design, and everything is incomprehensible and different everywhere! Share relevant information:

Answer 1

What screen resolutions should I design websites for in 2021?

Answer 2

https://getuikit.com/docs/width#responsive-width