http://nguipxnkrp3qrzrlduhsatpcpwehnblzmlkc5ifiumxq4z5jlh4lwvid.onion/os_archive/os_OPSEC_357.html
Anything to do with planning, inventory or income sources ( what books you have in your personal library, how many "things you own", un-booked travel plans etc...), part time revenue etc, stock picking and purchasing plans, business plans, business ideas etc. Do all of that on an airgap.