@madmax2 said:
how to resize poster to correct aspect ratio
what is the method or software to get this poster to correct aspect ratio 1:1.5 required to upload the poster?
do I need to crop poster (which means the poster is no longer how it was created)
or resize poster to that aspect ratio e.g. 2000x3000 max size which means the poster will now be distorted?
this is the poster
https://i.imgur.com/xabuhTA.jpeg
movie
https://www.themoviedb.org/movie/729780/images/posters

Never stretch. Or distort.
If possible, crop.
If cropping is impossible or would be an act of violence against the artistic conception of the poster creator, do not upload that poster.
Look for a poster that can meet the needs of the TMDb website's art direction.
In this specific case, this series already has 2 posters.

EDIT
See here
https://www.themoviedb.org/bible/image/59f7582c9251416e7100005f

Aspect Ratio
Images with aspect ratio of 1:1.33, 1:1.41 and 1:1.5 are currently supported.