If taking Youtube seriously, never do any of the following things:
For Small Youtubers: (up to 5k)
a: Sub4sub
b: Ask bigger Youtubers for shoutouts without having earned them.
c: Become a door-to-door salesman on Discord for your Youtube videos or your own Discord server.
d: Use a Youtuber's livestream to do the same thing.
e: Whine and complain about how you're not getting any views or subs in a Youtube video.
f: Rely on Youtube as your only source of income.
g: Let your reason for going into Youtube be of a materialistic nature.
For Mid-level Youtubers (5k to 100k)
a: Use your influence to damage another person, especially another Youtuber.
b: Charge serious money for Youtuber services (paid videos, sponsored content, etc) and take a casual approach towards delivering the goods.
c: Let the fame you get go to your head and do stupid things for money or attention.
d: Become cocky or condescending to your fans, viewers, and smaller Youtubers.
e: Say yes to every offer you're presented with.
f: Succumb to the social pressures you're bound to face from all directions at this point.
For Big Youtubers (100k or more)
a: Lose your perspective on what Youtube is and who you are as a person.
b: Take your fans for granted.
c: Allow your social status to inflate your ego, especially with that many people following you.
d: Neglect your personal life and relationships.
e: Think that your Youtube success will necessarily last forever and become complacent.
f: Fail to have a backup plan if something goes wrong with Youtube.
g: Allow Youtube to become all that is to experience in the world and shut yourself off from anything else.
h: Get into trouble with the law and try to use your Youtube celebrity status to get away with it.