Tomu, we all learn the basics and beyond through mistakes, and then come up with some preferred formation and orders after some harsh losses.
Could write a detailed guide on what I know, though there are lots of points and notes we only believe them after making the actual mistakes and then rectify with changes to turn those losses into wins. Experienced managers would feel ‘well, I know them all’, while relative beginners would feel overwhelmed by the amount of tactics involved (those who always stick with 1 formation with most single-position-players without any possible variation would not understand at all on why a simple move of AMC/AML from AMC to AML would totally change the match dynamics and assume their losses were out of luck).