Choco moist cake with chocolate icing|Beginners guide

Ingredients:
1 1/2 cup all purpose flour
1/4 cup cocoa powder
1 tsp. baking soda
1/2 tsp. salt
1 cup sugar

1/3 cup vegetable oil
1 cup water
1 tablespoon white vinegar

Chocolate icing:
1/4 cup cocoa powder
1/2 cup white sugar
1/4 cup cornstarch
a pinch of salt
1 cup evaporated milk

Please watch the whole video pra sa step by step guide.