How does a sea anchor help a boat in a storm?

hmm I think you meant "your vessel", but anyways it helps you so you may not blow off course into some random place, so when the wind dies down then they can just set sail

you can look at the compass and it will tell you where to go or if you have a specialcompass it will track down your tracks and you can follow it back

Normally, the Bow, the head end ( to borrow the railroad term) of a ship., There were some German warships that had an after anchor station, presumably when riding out storms between assignments....

boats help us because they are used for transportation in water without it we would be swimming across water. :)

Same way an arrow works, the front is pointed making the water go around the boat instead of the boat pushing its way through the water.