If you want to learn how to banish negativity from your life, there are two approaches you can take:
You can buy and study books on positive psychology, stoicism, mindfulness, and various related topics. You can read motivational books by Covey, Taleb, Holiday, and others. You can digest scientific papers on stress, post-traumatic growth, empathy and gratitude, sleep, diet and exercise.
Or you can simply read this excellent and engaging book by Anthony Iannarino. He has done all the reading, applied the lessons, and added his own compelling life experiences to produce what I consider to be an encyclopedia of positivity.
There is something in The Negativity Fast for everyone. Just like an encyclopedia, you don’t need to read every single chapter; you can sample those that better fit your current circumstances or personal preferences. For me, the chapters on changing your beliefs, reframing negative events, and focusing on helping others, particularly resonated. Others may benefit from suggestions on how to live with political divisiveness or practice mindfulness.
I consider myself a positive person, and I’ve read extensively in the literature, but I learned (or was reminded of) far more than I expected. Read it for yourself, or give a copy to someone who needs it, and I’m positive you will be pleased.