Choose the right field type
Use custom fields when your project needs information beyond the standard task fields. Choose a type appropriate to the value, then give it a clear name.
Numeric child rollups are explicit. Review which children contribute and how missing values behave. Hiding a column changes presentation while preserving its values.
Preview a formula
Formulas use restricted deterministic expressions. Review the expression, inputs, and previewed output before relying on a calculated result.
A formula uses the values and calculation rules available to it. Invalid input and missing data should remain visible rather than being replaced with an invented result.
Change fields deliberately
Hiding, archiving, and removing a field are different actions. Read the removal preview for formula dependencies and the choice about retaining existing values.
Conditional formatting applies explicit rules to help you scan a view. Keep readable labels and values so color is an additional cue.