edit

Please help I am a 16 year old student in the UK and have been trying
to learn how to edit config. sys autoexec. bat etc all that my teatchers can tell me is to use the edit command in doss mode but they cannot give me any advice of how to use it, I suspect that they also do not know the correct method so they just brush my questions aside with answers like no one needs to use these commands any more But I would still like to know. Can someone point me in the right direction or recommend some study material.