Not an experienced cook here and have these questions on baking cookies:
What does the egg yolks and egg whites do to a recipe?
Why some recipes call for baking powder and some for baking soda? both should make the dough rise so what is the difference?
Baking powder contains baking soda and an acidic ingredient to activate the soda. A recipe would call for soda if there is an acidic ingredient in the recipe that will activate the soda. Baking powder is used when there is no acidic ingredient present to activate the soda.
"If you want to make an apple pie from scratch, you must first create the universe." -Carl Sagan