If you have facial hair you just let it grow trimming it to the shape you want. If you don't have the facial hair, there really is no way of making it grow.
a man is able to grow a beard if his dad is able to grow a beard
The best way to grow more hair on your beard is to never shave.
If an Amish man has a beard that means he is married. Once they become married the need to grow a beard.
no
Shaving a beard makes it start to grow faster. --Shaving your beard is but only a myth, some have the ability to grow a beard relatively fast, while others do not, look at members of your family and generally you will fall into some category of that sort.
I have a rather large beard and I got mine by giving up shaving
you'll generally start to see facial hair a couple of years after pubic hair starts to grow. Facial hair is "beard" from the start, but you may not have enough to grow "a beard" for a couple of years after facial hair starts to grow. Needing to shave at 14 or 15 is pretty common, but having enough hair look like an intentional beard is usually a couple of years after you start to need to shave. Not many men can grow a full-face beard at 15, but most--definitely not all-- can by 18 or 19. It's also pretty common for full-face beard to not be possible till early 20's.
By taking testerone
yes,
Don't shave .
Testosterone
Nothing.