I think it was quite well organised we split ours into sections: sponsor docs, applicant docs and proof of relationship.
The proof section consisted of a timeline which matched our description of how our relationship developed (incl photos/receipts anything that confirmed what we had said, that we could find), chat logs, joint bank account information with declaration from bank manager showing dates held, think we had like 15 written declarions from people we knew (2 notarised from my family and her family), joint tenancy agreement all pretty basic stuff
Our case was very straight-forward in my mind (no children or previous serious relationship, healthy, no criminal record, decent education and coming from a country with a similar standard of living) and I have also been both living and working in Canada for the past few years.