I parent my daughter to manage her ADHD, to be upfront about which areas of life might be harder, and to focus on areas that will add positivity to her life or let her talent shine. As a child with undiagnosed ADHD I really struggled and spent much of my schooling miserable.
I teach them that there is no prize for being the good guy, accommodating of bad behaviour or putting up with stuff for the sake of maintaining the peace - basically have told them bad people get ahead, and the best way to manage in life is to find your own balance between being a good person and being selfish enough or forthright enough to protect yourself and look after your own interests, be that your worth in a job, your self esteem or the way people treat you etc.
Also to be honest about mental health issues, my family had a lot of mental health issues and addition problems but they were never well handled or talked about. we talk about it, about genetic predisposition, and looking after yourself mentally and physically.. We tend to be very matter of fact, scientific, open. For instance, i no longer see a few family members and my kids know that it is because they are toxic (to me) and that my mental health can't handle it.
I think I am a lot more honest about how brutal the world is, how ordinary much of life can be so that you have to snatch the small moments of joy to build contentment. I try to make them feel secure in themselves and charge them with being responsible for their behaviour. I want them to stop to enjoy that cup of tea or that walk in the park or the snuggle on the couch with takeaway and a movie on family night...because that is life, not the big events - major travel, weddings, births etc...
My parents did a good job but left some holes and had a different approach....can't wait to see what my kids do with theirs to see what I got wrong!