C200 Leadership Theories

I have been out of school for 10+ years. I am having trouble with the readings for the different Leadership Theories. I know I must pick one and use it to compare myself / previous manager to, but I start reading the theories and all the scholarly PhD level language makes me want to nope out of there or my mind wanders and I can't concentrate and learn. I wish there was a summary of the theories written in a more down to earth style. I don't know how y'all are passing this so quickly. Any tips?