Go to gmail.com and clicking on the gear icon in the top right, next select Settings and scroll down to the Keyboard Shortcuts section and make sure the radio button is selected to enable shortcuts. Save changesand you will be automatically redirected to your inbox.
These shortcuts will make you more productive and save you time, all you need to do is spend a couple of minutes a day learning them!
Do this now: go to your inbox and practice the combination of opening the latest conversation, move to the 5th conversation and scroll through the messages.
Do this now: Practice these shortcuts on your inbox now.
These Gmail shortcuts are my most used , but there are more and a complete list can be found from Gmail's help pages.