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The idea of first aid, for many, comes down to what you purchase. Which kit is the very best to buy. Most people also tend to push you towards the various types of kits and what they have inside them. Its rare that you have a resource where you can really learn about trauma and large SHTF injuries. If you know how to react and how to treat someone with large injuries, its much better than having a cool tool that could help someone who knows how to use it.
This is a great look at prepper first aid through article and podcast. There is one thing you should be conscious of. Its the idea that you are going to need true practice as well. The best way to do this is by taking your free local training course through CERT.