Low light, a certain distance and an angled gaze will help you learn how to see auras for the first time. All living things have auras! People, animals, plants and even the earth itself.
Some people have always been able to see a faint glow of light around other people and just take it for granted, although the majority of people will lose this ability as they grow out of childhood.
Thanks to Kirlian photography most people now generally accept that this energy field does actually exist. However, unless you can actually see them, this knowledge is of no use to you.
The first hurdle in learning how to see auras is the 'seeing is believing' syndrome:- If you have never seen an aura, then you won't believe that you can. If you don't believe you can see one, then you will be unable be able to see one!! - Catch 22!