Gradient Descent: How AI Learns

You are blindfolded in a hilly landscape. Your only goal is to reach the lowest point in the valley. You cannot see the whole landscape. You cannot see where the valley is. You cannot teleport there. What do you do? You feel the ground under your feet. You figure out which direction slopes downward right where you are standing. You take one step in that direction. Then you feel again. Step again. Feel again. Step again. Eventually you reach the bottom. That is gradient descent. Exactly that. Not