The United States and the United Kingdom favor sweet cream butter. However, most of continental Europe prefers cultured butter, which in the US, is commonly referred to as “European-style” butter.
How To Store Sourdough Bread?
What Is A Leavening Agent In Baking?

The process of leavening occurs when the gluten structure or air spaces is filled with a leavening agent, making the dough or batter to rise and expand during baking. Although carbon dioxide is the primary cause of leavening, other gases, such as ammonia gas, water in the form of steam, and integrated air (added during mixing), also contribute to the expansion of baked goods.
What Does Baking Soda Do In Cookies?

Because baking soda will make the cookies spread out and brown on the baking pan rather than up into the air. By increasing the pH of the mixture, protein coagulation is inhibited, promoting spreading. This results in a more uniformly baked cookies since the dough has more time to set before the eggs set.