Firstly context matters. Since your context is different to mine, my advice may or may not be useful. For starters children are different, so what worked for me may not work for you.
Advice -before- the first birth is even less useful. They have a plan. Your experience is meaningless in the face of the plan. When you hear the plan you don't need to comment on it. Smile, nod and agree. Don't worry, the plan won't last very long...
Mostly parents don't need advice. They need support. An ear to listen. A voice to agree this is hard. A prediction that it gets easier (it does). A view that they're doing a good job (even when it doesn't feel like it.)
Now, I’ve had useful tips for infants since they’re basically a brain stem with a mouth and a butthole, but when they get older it’s my experience that kids are just too different to apply any one broad set of strategies to them all.
I have a lot of respect for teachers, I don’t know how they command a whole room full of them.
> Parenting is going to be the most challenging, frustrating, disheartening thing you ever experience. But every once in a while there's going to be little moments that make it all completely worth it. Learn to recognize those and hold on to them.
Both the acknowledgement that parenting is a fucking nightmare a lot of the time and you're not just doing it wrong, and a reminder to consciously recognize and remember the precious moments.