How does the 80-20 principle apply to house decluttering?

The 80-20 principle, or the Pareto Principle, suggests that 80% of effects come from 20% of causes. Applied to decluttering, it implies that we often use only 20% of our belongings regularly, while the remaining 80% might be unnecessary clutter. Identifying and prioritizing that crucial 20% can streamline the decluttering process.