While perfect is difficult to achieve, I'll walk you through the wood splitting technique, and you can practice until you are nearly perfect and at bonafide lumberjack status.
First, you'll position yourself where the axe hits the wood with your arms extended. Err on the side of hitting closer to closer to you, so the handle does not hit the wood if you miss. Have your legs shoulder-width apart in a stable and athletic position.
Set the wood on its end, on a chopping block if possible.
Pull the device back straight over your head and build up speed as you swing but allow the axe head's weight and momentum to do the work for you. Before chopping or splitting, ensure there is nothing and no one that can be easily broken nearby and nothing overhead that you could accidentally destroy in your lumberjack-inspired excitement.