What Software from Adobe can i make Greeting Cards
You can make Greeting cards on Indesign and also Illustrator.
If I had to pick one of the 2 for creating greeting cards I would go for Indesign.
Depending on the (combination of) kind(s) of contents, you may use at least Ai, Ps, and Id, in any combination, in any order or going back and forth, also depending on the amounts and significance of the kind(s) of contents.
So, especially since you ask in general, I believe that sufficiently many different cases will make it good to (be able to) use more than one, and to be able to take advantage of their different strengths.
The artwork for your greeting cards should be done in Illustrator or Photoshop.
The layout should be done in InDesign.