Trying to understand the value of SAR and DAR in video/FFmpeg?

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I convert video using the FFmpeg utility to WEBM format using Dash technology.

I convert one video, focusing on the frame height. In resolution (frame height):

  • 2160p
  • 1440p
  • 1080p
  • 720p
  • 480p
  • 360p
  • 240p
  • 144p

The frame width can be any, I compress, bring the frame to the required height, and the width is proportionally adapted relative to the specified height

I don’t quite understand what role the parameter plays SAR and DAR.

Is it worth setting different values ​​for each height, how will this affect the quality of video viewing for the user?

What if we add to all the listed qualities:

sar=1:1,
dar=16:9

What are the possible negative consequences in different situations?

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