If you have an off the shoulder dress or one with a scoop neckline, it will tend to fall off the shoulders and keep falling. Adding a constrained group allows you to pin the neckline in place.
You'd use Soft decorated groups if you had like a patch pocket that you wanted to move with the garment instead of sliding off. Rigid Decorated group would be for buttons or things like that which are "rigid."
Off the top of my head, I don't remember when you would use the Choreographed group.
If you had a dress where you wanted the bodice to be stiffish, but the skirt to be floaty, you would add a second Dynamic Group. The bodice dynamic group would have higher fold, shear, and stretch resistance and lower cloth density. While the Dynamic Group you assign the skirt to would have lower fold, shear, and stretch resistance and a higher cloth density.
For basic information, get Esha's free dynamic cloth tutorial from RDNA. If you really want to get into dynamics, then get her masterclass tutorial. (I'm not sure if it's still on sale)
You'd use Soft decorated groups if you had like a patch pocket that you wanted to move with the garment instead of sliding off. Rigid Decorated group would be for buttons or things like that which are "rigid."
Off the top of my head, I don't remember when you would use the Choreographed group.
If you had a dress where you wanted the bodice to be stiffish, but the skirt to be floaty, you would add a second Dynamic Group. The bodice dynamic group would have higher fold, shear, and stretch resistance and lower cloth density. While the Dynamic Group you assign the skirt to would have lower fold, shear, and stretch resistance and a higher cloth density.
For basic information, get Esha's free dynamic cloth tutorial from RDNA. If you really want to get into dynamics, then get her masterclass tutorial. (I'm not sure if it's still on sale)