The image used for Featured Items in Knowledge (and maybe blogs?) is the tricky one. It's part of the responsive setup with featured items.
By default featured item widget uses:
* place icon if no images in content
* first image found in the content (usually this looks terrible in a featured item post)
* Images found in Article Summary.
Since Article Summary doesn't appear to be used anywhere that WE care about in the community itself, I use this purely to include what was previously called Cover Photo in Classic.
My preferred sizing turns out to be a 2:1 ratio (e.g., 600x300 jpg).
If you have words on it that you don't want cut off use a margin buffer around the edge sorta like this. No precise measurements here but i'd estimate that to be about 1/8th the width on each side and ~1/5th the height on each side.
(precision is not accuracy
