The issue with "courses" and "books" is that it covers the basics, the essentials.
It covers the middle-of-the-Gaussian curve (if you know what that is... one of my favourite life-think-concepts)
It's like the learning-to-read or learning-to-walk.
If you've got a decent head on your shoulders... all that stuff, you'd learn it through friends or family or trial & error, yourself.
The hard stuff is the stuff that seems only applicable to YOUR kid.
Other parents will come along and say "Well... this (explanation) worked for us..."
That's the hard part... when you know what other parents did isn't/won't work for you/your-kid...
And then you're off to find your own non-book, non-video solution.
Looking back on our kids (now age 7 & 11)...
We got a lot of advice from friends & family that didn't work on our kids...
Some kids are easy.
Some kids are hard.
Some kids are messed up.
I wanted to firmly believe (when we started) that good parenting & smarts could rule all.
There ARE kid conditions that will be out-of-your-hands... and you need a doctor or special medications...
And if you don't get there... consider your kid blessed.
From the parents I've talked to in my life... I'd say 1-in-2 Parent/Kid goes through something astronomically difficult in the first 3 years.
You'll know when you get through about 3 years which side you had.
We had/have one of each. Our tough kid (first) and our easy kid (second).
It's interesting listening to other parents.
We've actually been talking with a couple down the street recently who have an 18-year old son... he is bi-polar/manic/autistic/severe-anxiety/suicidal... one of the first times I've talked to parents who've dealt with more shit than we've been through with our oldest. And my daughters best friend, was diagnosed with brain cancer, at age 9, two years ago. They've been toughing through almost 2 years now trying to grind through with smiles/positivity... but it can't possible be like the smiles/stories they post on Facebook. Puts things in persepctive.
Point here: Find your other parent friends... talk to them A LOT... if anything, just so you know when you have the goods/bads. Helps you appreciate things. It's not so much for solutions... it's just for the talk... and the listening.