Does anyone else can their jam, chutney etc so that it lasts in the cupboard for longer? Most people do not seem to know what I am on about, when I ask them

I know that you are able to can most food stuffs, I am planning on trying to do more this year as a way of preserving the product from my garden for the winter.
I would be really interested to hear what other people do, and maybe I can get a few more ideas.
Take care Nikki