grid features use cases

Hey, i have a few questions regarding some grid features:

1. When should you use the span keyword over line numbers? e.g. grid-column: span 2; instead of grid-column: 1 / 3;
2. In what situations should you use grid-template-areas or named line numbers e.g. [xyz-start] 1fr [xyz-end], is it so things are easier to keep track of?

Thank you in advance.
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