1/ Using your tent
The first thing to do when caring for your tent is to use it properly.
Before pitching your tent, make sure that the front entrance is securely closed.
This will prevent you from over-stretching the canvas when you assemble the poles.
Also, even if the guy ropes are there to reinforce the resistance of your tent against the wind, there is no point in stretching them too much.
You risk creating too much tension on the canvas.