I've been looking into all sorts of them recently: logseq, appflowy, vikunja, etc. What tools do you use? Why? What problems did you run into with the previous set of tools you used for this job?
Right now I'm primarily interested in finding a "zero-knowledge" (cloud provider doesn't have access to my data) system for task management. Needs to be able to have recurring tasks and tasks organized in some interesting/useful ways (by projects/labels/something, maybe a kanban and table view). Deadlines and time tracking/planning interesting but not required.
Right now mainly Nextcloud for task and kanban with Jtx and Deck on android.
For my knowledge markdown files edited with Quillpad, Zettlr, Tangent, Nextcloud …
That's not zero-knowledge but that's work for me and I feel that secure enough in my case for my daily life. :)