Avoid
Endless, meaningless praise. Not everything they do needs a parade. Encourage specific actions with praise but not every little thing. They’re people and they’ll make mistakes, make sure you’re picking up on those as much as you’re praising the good things. No balanced person can go through life thinking they do no wrong!
Being their best mate. You’re a parent and you need to act like it. Punish when it’s needed and don’t be afraid of them getting upset or angry and you seeming like the bad guy. Life isn’t a picnic and they need to be prepared for disappointment.
Being an ATM. Money’s no meaningless thing and the sooner kids learn the value of it and the importance and joy of saving for something they really want and then getting it, the better. Set a weekly allowance and don’t be afraid to say no. Spending money stupidly leads to disappointment and doing without and learning this early will mean when they leave home they’re less likely to make a much more dramatic mistake which could lead to them going into debt!