The 11 easy to use keyboard shortcuts in gmail are as follows (these are the defaul keys, they can be changed at any time).
- k – newer mail,
- j – older mail (both works both in inbox and in mails)
- x – select mail
- y and e – archive
- enter – enter the mail
- r – reply
- a – reply to all
- f – forward
- Tab + enter – Send
- g + i – goto inbox
- s – star
? – show the shortcuts
Now you are really going to throw that mouse away.