When to Use Signals:

1. When the Value Changes Over Time
2. When You Need Reactive Updates in the Template(.html)
3. When You Need to Share State Between Components

When Not to Use Signals:

1. When the Value is Static and Never Changes
2. When the Value is Computed Once and Doesn't Need Reactive Updates

Conclusion:

Use signals for reactive state: If the value changes and you want Angular to react to those changes (e.g., update the UI).

Don't overuse signals for static values: If the value is constant or doesn't need reactive updates, stick to regular variables or properties.