Emotional coping strategies, meditation, and mental illness are topics you should have already discussed with your kid before they hit puberty. By the time your kid is 10, they should know a few breathing exercises, how to deal with uncomfortable thoughts, which mental illnesses run in the family, and what works for calming them down in a panic attack.
The problem with many parents is they don’t teach their kids how to be teenagers until the teenagers are already experiencing puberty. That’s wrong. You have to be prepared and your kids have to be prepared too. Even if mum and dad know what to expect, it’s no good for 14 year old Tim to suddenly be angry all the time and not know how to deal with it. Tim ought to have a firm grasp of mindfulness skills already by age 14, and he should know what to expect from puberty and who he can talk to about it.
Also some of the worst mental illnesses a young person can deal with are caused by early childhood abuse, sooooooo don’t abuse your kids and raising teenagers will be much easier.