Leave a status message when marking a task complete. I use Obsidian Tasks plugin, but I think the same question is valid with native tasks.
Often, when completing a Task I would like to leave a short note with the task results. Left Voicemail, Talked to XYZ, Case #123, account will be closed., etc.
Do you simply append that to the task itself? It sure would be nice to have it more structured so I can see (Dataview or whatever) a list of completed tasks and their associated statuses.