Starting a fire with flint-and-steel is harder than most methods available these days but in a SHTF situation this may be the only option you have. Bushcrafters still prefer this method of starting fire than the modern day ferro rods you can pick up today.
In the link below shtfdad.com show us how to find and make the flint from flint, chert or quartz and how to strike the steel on the flint correctly, thus creating sparks to direct at your tinder and then blow into a fire.
You can pick up a flint and steel kit really cheap and I would recommend keeping one in your bug out bag as a backup. I got mine from Amazon for about $25, you can get it here.
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