Sometimes when parents are considering learning some strategies for making parenting easier, they are concerned that there really aren't any approaches that are effective, because "Nothing works for all kids." Well they're right. Every child is unique. And there is no strategy or technique that is going to play out precisely the same way with all kids. And some will play out very differently with different kids. This, in fact, is one of the reasons why I think counseling and parent coaching can be so helpful. "Off the rack" parenting approaches found in books though often helpful, can frequently frustrate parents as their kids respond very differently than the book predicts. And that's not to mention that you can find books that recommend just about anything you can imagine, so there's little consistency from book to book. I work with lots of parents who have often read a at least a half dozen parenting books, and are well informed yet confused because none of the advice seems to mesh together.
Examples of Principles You Count On:
When limit setting and consequences become the focus of the relationship, and opportunities for connection aren't there or are too few, things tend to go down hill.
Control is a basic human need. When it is shared with children in appropriate ways, kids are much more apt to be cooperative.
Attention to approximations of behaviors you're wanting from your child tends to bring about more of those wanted behaviors.
Attention on what is going poorly will lead to more poor behavior, and will also lead to the desired behaviors decreasing as well.