My birds old man is a mason and TBH it seems its not really about anything these days other than just them enjoying each others company and helping each other out (often in business, and occasionally in ways that are anti-competitive etc), its just an old boys club basically.
But if you read the internet, it will tell you that they run the US etc and that masonic symbols are hidden in the designs of washington and the whole american political system is on its knees in front of them