http://mail.nowherejezfoltodf4jiyl6r56jnzintap5vyjlia7fkirfsnfizflqd.onion/opsec/index.html
Dread /d/opsec : Dread being one of the largest darknet forums out there, their opsec board is a fertile ground for truth seeking Sam bent's youtube channel : Ex-darknet vendor, well versed in anything opsec-related, with solid background on the law in general.