The purpose of SyneMind is to be your Synergistic Mind - your external brain which helps you remember things you should know, and everything you have done and should do. A one-stop Life Admin Dashboard that lets you find facts easily, and get organised around them.
You save to it whatever you think you may need to know in the future - from a short text about a meeting you just had through the plumber's invoice for fixing the kitchen sink to the purchase contract for your investment property.
You organise these into notes, which can have sub-notes: "my investment properties" can be broken down into "house" and "apartment", "house" can then branch down into "maintenance records", "management agent", "bank loan", "expenses" etc. This gives you a system for quickly finding what you need, so you do not have to go digging into your mailbox to find that invoice from four years ago to figure out how to contact that plumber again.
You can then form groups, and share records with them. Investment property owned by the family? Documents belong to both partners so both have equal access. Startup company has company registration records, bank account information, contracts, web server instructions, bills, whatever... Form a group for shareholders, another one for freelancers that need temporary access, another one for prospective investors - then only share into each what is relevant to them.
Consider each note just a starting point. You can later edit it, expand it, add new documents to it. But you can also attach quick comments, tasks or just small "to do" notes - "tasklets", which then surface separately in your dashboard helping you remember what needs to be done across everything, and when.