Oh yeah, we also have a wall calendar with my wife. But personally I use digital calendar.
Its not as messy for me, but took time to come up with something that works for me. The three categories are intentional. “Next” are basically simple tasks that can be done at once (but take more than a few mins), added after planning, so that doesn’t really change once they are added (and I just tick what is done). In progress, pretty similar, but longer term tasks (maybe not perfect name for the category). I usually keep a section under the task based on how much I expect sub-tasks or notes. And inbox, well its just add all, plan later list. When something moves to next or in progress or is done immediately I just tick it in inbox. In inbox I have 3 types of tick-boxes. Square ones - if I expect a task to be doable fast without moving it anywhere (in GTD those are the under 2 minutes tasks). Then round one for tasks that need to be added to next. And triangle for tasks that will be longer-term tasks and need to be added to the in-progress section once I decide to do them.
I think Signal has this by default. It’s called “note to self”. So not really my idea 😀