The core books of freemasonry are available in this grand library upon which you are reading this. So far I have not found anything sinister in their writings, but in experience I have found their system to be a "closed shop", no more or less prejudiced than any other social group. If you study these books you will be able to identify where they did key ops that changed the world in the last 300 years, and also where bad things that changed the world were blamed on them, that they probably didn't do, or at least approve.
https://archive.org/stream/MoralsAndDogmaOfTheMasonic/0008MoralsAndDogmaOfTheAncientAndAcceptedScottishRiteOfFreemasonry_djvu.txt
https://archive.org/details/An_Encyclopedia_Of_Freemasonry_1916_Vol_1_-_A_G_Mackey
http://www.themasonictrowel.com/ebooks/freemasonry/eb0091.pdf
You can also listen to Manly P Hall on yt. I don't find him very interesting. He was speaking to his time. I like Bill Cooper very much. He spoke to our time.
http://hourofthetime.com/milton-william-bill-cooper-mp3-collection/
If you know the enemy and know yourself, you need not fear the result of a hundred battles. If you know yourself but not the enemy, for every victory gained you will also suffer a defeat. If you know neither the enemy nor yourself, you will succumb in every battle.
Sun Tzu
I'm not saying Masons are the enemy. I'm saying there are many groups active bigly, whose agenda conflicts with what you and I would consider a moral course.