The left side shifter controls the front 3 chainring gears (where your feet are, on the right side- those three large cogs.) The smallest cog is the easiest of the three. You might want to get familiar with the direction the shift goes when you move the lever on the left handlebar shifter. That way you won't get confused as to which way you need to shift to get an easier gear up front. And you can always glance down to the right to see what gear it is in.
In back, it's just the opposite. The biggest gear is the easiest.
Tzvia- rollin' slow...
Specialized Ruby Expert/mens Bontrager Inform RXL
Specialized SWorks Safire/mens Bontrager Inform RL
Giant Anthem-W XT-XTR/mens Bontrager Inform RXL
Fuji Newest 3 commuter/mens Bontrager Inform RL
Novara E.T.A commuter/mens Bontrager Inform RL