How do u pick you battles

Hi mummies, How do u pick the battles to fight for the day...weather is it raising ur child the way you want, being strict to him or her , facing mother in law nagging, constantly having a messing house, working fulltime in office Sometimes I read books and watch YouTube on how to educate and raise my child a certain way but is not mentally and physically possible for me...#1stimemom #advicepls