How to make brownies?

I want to learn how to make brownies

Brownies are very easy to make, but you have to watch the clock, because they don't taste good burnt. Also, don't put the oven on a higher temprature, because the brownies will only cook on the outside, while the middle will still be "raw".
My favorite recipe: You can add other things, but it is best to do it how the recipe says and then, the next time, change it to how you think you would like it.

INGREDIENTS
1 cup butter, melted
3 cups white sugar
1 tablespoon vanilla extract
4 eggs
1 1/2 cups all-purpose flour
1 cup unsweetened cocoa powder
1 teaspoon salt
1 cup semisweet chocolate chips
DIRECTIONS
Preheat oven to 350 degrees F (175 degrees C). Lightly grease a 9x13 baking dish.
Combine the melted butter, sugar, and vanilla in a large bowl. Beat in the eggs, one at a time, mixing well after each, until thoroughly blended.
Sift together the flour, cocoa powder, and salt. Gradually stir the flour mixture into the chocolate mixture until blended. Stir in the chocolate morsels. Spread the batter evenly into the prepared baking dish.
Bake in preheated oven until an inserted toothpick comes out clean, 35 to 40 minutes. Remove, and cool pan on wire rack before cutting.

my brownies always come out rock hard =(
they're done when they look like their not.
idkkk it's hard to make. lol