Well, this is a basic foundation rule for advancing the hockey puck out of your defensive zone. However, this rule can be applied to all areas of the ice when it comes time to maneuvering the Hockey puck into attacking position or regrouping.
Even though this is a basic hockey skill, teaching this at your next hockey practice will greatly improve your hockey skills and basic development.
So here's how this "Weak side / Strong side" works!

Take a look at this basic picture. If you draw a line down center ice from one end to the other, you will see that you have two halves or sides.
Now, where ever the puck is on either side is know as the "Strong" side. Where ever the puck is not, is know as the "Weak" side. So as you can see, this is pretty basic.
Now, with knowing this basic rule, we can start adding on more complicated items or tactics that will involve this basic hockey skills rule.
If you were the hockey players that has the puck on the strong side, you would always want to exit your defensive zone towards the weak side.
This would mean that if you were in the corner, you would want to take the puck behind the net towards the weak side and exit the puck up the weak side.
The reason why they call it the strong side is because all of the players on the other team are on the puck side hoping to block the puck from coming out of the zone...hence it being known as the strong side.
This means that there will not be any attacking players on the other half known as the weak side. This is why you would want to exit the puck on or towards this weak side.
Now, when you are going from one half to the other, you need to follow the next basic rule.
This states that the "Player without the puck...goes behind!"
