No idea what I’m learning...(super six 65 fish)

Welcome to FABO.
As above get your service manual and start reading.

If you dont know what a part being described is, ask and google, look at images. No one here knows what you do or don't know, so we might say something you don't know, ask for clarification. Most will bend over backwords to help.

THIS IS NOT YOUR APPLICATION, JUST A REPRESENTATIVE EXAMPLE OF A BRAKE BOOSTER.(black device between firewall and brake master cyl)
Power-Brake-Booster-Test-678x380.jpg