I shave, so my armpit hair grows so quickly and very dense. Even after shaving it's not baby skin soft, or 100% gone.
What is the best way to care for armpit hair?
And is there a way to leave the armpit soft, and bare after shaving?

Thank you

Have you tried waxing??

Or perhaps Nair?

I have very dark course underarm hairs too... I have to shave upward, downwards, then left and right to make sure its least visible...

How often do you shave?

Shaving does leave the area a bit rough.
Waxing or sugaring would help tons! But it can get expensive buying the stuff. So here's a recipe for a homemade sugaring treatment that will help you save some money.
Homemade Body Sugar for Quick Hair Removal - Associated Content

Also, moisturise the area at night. Preferably with cocoa butter.

Hey mostly all the nair products are on for sale for 3.95 I think. I got the sensitive 1 and it really works.

At CVS

Why bother shaving? Or removing the hair for that matter. Stay natural.Wash regularly... use the right deo... that's it.

I always shave my armpits in the shower... it softens the hairs and makes it easier to remove them.

Moisturise afterwards as well as shaving actually takes off a very thin layer of skin and the new skin dries out easily.

Try a sharper razor. I switched from two blades to three, and upgraded from super cheap to a little more expensive and found it made a huge difference.