I found that the manual still contains information that is missing elsewhere, for example:
- Province Defense Troop Composition (although I have the feeling that they are not 100% correct)
- Castle Type for each Nation
- Item overview (If you want know which items provides effect X, the manual seems much easier to use than the wiki. The spell reference is good to learn what you can forge with Path Y & Z; the wiki is good to look up a specific item or about path boosters)