In Planner, labels can help you quickly see certain things that several tasks have in common, like requirements, locations, dependencies, or important time constraints.
Add labels to your plan
On the Board, select a task, and then choose the colored boxes on the top right side of the task's details. Select Set label for the flag you want to use, and then give it a name.
Once you've defined labels on one task, they're available to all tasks in the plan.
For example, I can define the pink label as "Approval" on the "Record webcasts" task, and then set that same flag on every other task in my plan that requires approval.
More ways to get organized
If you need more ways to organize your work, you might find buckets helpful. You can sort tasks into buckets to help you organize tasks into things like phases, types of work, or departments.
Looking for a bigger-picture view? Try the Charts view for a quick look at your plan's overall progress.