Here is a prepper's guide to ammunition calibers and their imperial or metric sizing.
Revolving credit is the most used and least understood lines of credit out there. Easy to get, easy to use, easy to abuse. Paying off your food stash and bunker is one thing, but while the world still operates, buying those things takes some amount of cash or credit. Lets talk about credit and why you want to keep some around, and if you have debt in revolving credit, in what order to pay them off. Keep in mind, revolving credit is usually considered expensive credit or high interest credit.
Imagine this, it's two weeks after the SHTF and you running low on AAs and there isn't a D cell around for 200 miles without a paranoid trigger finger between you and it. Your Maglite is dead, your comms radios are about to be done, and smoke signals draw too much attention. If you haven't thought about this before, then how about now?
Brewing beer is actually quite easy and, its a free (as in beer) pastime. Yes the supplies might cost money and time, but the methodology is as old as civilization; thusly public domain. The basics are simple and provide a means of making good beer that you can enjoy, share and trade.