How to sort and delete sets of Gmail messages: 4 steps (TechRepublic)

TechRepublic: How to sort and delete sets of Gmail messages: 4 steps. “You might want to mass delete email from Gmail for many reasons: To remove non-work-related messages from an account, to achieve ‘inbox zero’ as part of a personal productivity effort, or—more mundanely—to reduce the storage space used by attachments. Some people pursue #NoEmail—and start to treat email as an ephemeral communication channel instead of a permanent archive.”