Control + D Will save you a lot of typing!
command + d. starts selecting next thing same as highlighted
Easy Lorum Ispon
Just type in Lorum and hit tab and you'll get a snippet of Lorum Ipson, like so:
This allows you to quickly write HTML if you want to create a main section, type main then a tab. If you want to create a new section, type section.class-name and hit tab. Emmet will create the element with the tab, saving you hundreds of hours worth of development effort!