Dawn at Doing it for ourselves in Wales has just posted about preserving food.
Do go and read this. Do not take risks with your life.
I worked for most of my adult life in the food industry, from growing fruit and veg to meat inspecting in a slaughterhouse to cooking in a Deli Factory.
Botulism is a killer, pure and simple. I have not seen the relevant post that Dawn refers to but know that it is highly irresponsible and potentially extremely dangerous.
If you cook vegetable sauces ready for the winter, chill them fast and get them in the freezer or buy a pressure canner.
That's all for now, I will be back later with a post.