Here are a few videos, articles and books related to self defence that you might find interesting.
Learn something useful in 5 to 10 minutes
Situational awareness and body language are two very important elements of self defence, and are also useful and important in life in general:
Amy Cuddy: “Your body language shapes who you are”
Can the way you walk make you a more likely target for assault?
A very good overview of what situational awareness is, and how to develop it.
Learn more things:
A book about the importance of gut feeling, and the ways human predators work to get close to their prey. This book has valuable information about danger signs that can alert us to potential danger, and how to deal with it.
This book isn't about a specific style of self-defence, but many of the things Rory Miller discusses are part of the principles of Krav Maga. In particular, identifying and avoiding dangerous situations, de-escalating confrontations that could become violent, and some principles for how to train in a way to transfers into self-defence skills that are usable in real life.