Some questions in comprehension

[Christian Eckert]

Hello,   maybe someone could give some explanations to the following questions.   1. What is the meaning of  *scratch* e.g. in the context *build from scratch* and so on 2. What exactly is the meaning of *image* 3. I read it recently, what is meant by the Debain's archive structure. What does it look like?     thanks for the time   Christian