OPSEC, while generally used in military or business environments, it's a huge thing to learn in order to increase your chance of survival in a community or a group. Much of this is common sense. This is why we try and keep people from posting what resources they have, arms, training, etc. Keep all that stuff within your group, don't blab it all over the internet.
Books to consider -
Prepper OPSEC: How to Keep Your SHTF Preparations Secret So You Won't Be a Target

The Prepper: #2 OPSEC

Operations Security (OPSEC)

Operations Security (OPSEC): A Critical Tool for Enterprise and Personal Security (Tactiks Rapid Reference Tools)

I thought this was funny
Books to consider -
Prepper OPSEC: How to Keep Your SHTF Preparations Secret So You Won't Be a Target

The Prepper: #2 OPSEC

Operations Security (OPSEC)

Operations Security (OPSEC): A Critical Tool for Enterprise and Personal Security (Tactiks Rapid Reference Tools)

I thought this was funny