You do realize the card types are organized in a straightforward manner in the thread Ildar is referencing. Take a look here and see if your opinion changes.
If you use search in this topic with specific keywords you’ll easily find multiple examples for most inquiries. This is why, in my opinion, it makes it better to consolidate the inquires into main threads.
As for stack-in card, it was the replacement for vertical-stack-in-card and plays a little nicer with card_mod.
After looking at your code, the mod is not on the stack card, but rather the Entities card. The solution is in the Entities Card examples in the link Ildar and I provided.
Try
card_mod:
style: |
.card-content {
margin-top: -24px;
}