I'm trying to do a cosmetic bottle in blender but i don't how to do this thing in the image. How to do this round edge on the cap. Can anyone help me?
Add a cylinder with 16 subdivisions. Add edge loops Ctrl+R to define the indentation position. Select the faces representing the indentation and press I,B (to enable Boundary mode). Repeat it twice (to create the extra edge loops for subsurf creasing). Extrude it inwards (E), then inset again as before.