From the cog icon in the upper right side of Gmail's dashboard, click 'See All Settings.' Select Filters and Blocked ...

You can mark all emails in your inbox as read on the desktop version of Gmail, or you can limit it to emails within a folder, ...

To mass-delete all your emails on Gmail, click the "Select" box, then "Select all conversations." Or you can choose specific ...

If you have old emails from years ago still sitting in your inbox then now is the time to clear them out, and there's a quick way to do it.