Newbie- beaglebone v beagleboard

Hey guys,
I am still a relative new comer to electronics and brand new to this all in one embedded systems. As I look through these discussions I am confused about when things can apply only to the beaglebone and only to the beagleboard. As far as I can tell there seems to be a lot of overlap except the beagleboard doesn’t have the same gpio and pwm possiblities. Also the whole video and sound issues. Can somebody clarify for men when instructions can and can’t overlap and how to tell?

Are you referring to a particular set of instructions? I’m afraid you’re gonna have to be a bit more specific, just show us what you’re looking at and maybe someone can give you some insight.