I want to show you how to take photos, now Specifically photos of fire.
First of all you must have camera :) for example I have Canon EOS 100D
then you must set priority of closure for fire is best 4000, and that's maximum for my camera, but it must be night, when I took this photo it was 21 hours PM and it was in August.
If you have it you must set ISO for 6400 and it is the last thing that you must do.
But the best way ti learn is trying :)
I hope it helped you, I am not profesional photographer, but I thing it can help someone.