Recommended Microsoft application to act as solutions bank?

I am currently using Tasks by Planner addon to my Team site to serve as a solutions bank.  Baskets are organized by common tasks and processes.  Under each, we have problem cards.  Each card has a description of the issue/causes.  As we discover solutions to the problem, we add them as checklist items, attach pictures, tip sheets or other documents.  

The application is ok, but I know I am going outside the intent of the planner tool, so I sometimes have issues.  People complete the task, which hides it.  They assign or put due dates on them.  They may accidentally move them into the incorrect basket.  Is there a better Microsoft application that would meet my purpose?

Thanks!