'Notebook' is all I can think of. When someone else compiles a list of answers to common questions/problems it's called a 'crib-sheet', but when you compile your own crib-sheet, that's a way of cheating in exams!
About 100 years ago people used the Latin phrase 'vade mecum' (= 'go with me'), but nobody uses that now.
On the web, you may have come across the term 'FAQ' - Frequently Asked Questions (with, of course, answers).
But for your purposes I can't think of any improvement on 'notebook'.