==== filter on multiple from addresses ====
When creating the filter, use something like below in the "From" field
(email1@host.com OR email2@host.com)
This will do a search for
from:(email1@host.com OR email2@host.com)
==== keyboard shortcuts ====
* To enable keyboard shortcuts:\\ Gear icon -> Settings -> General -> Keyboard shortcuts -> select Keyboard shortcuts on -> Save Changes
* press ? to display the keyboard shortcuts in gmail
* e - archive
* # - delete
* https://support.google.com/mail/answer/6594 - lists all the keyboard shortcuts.