Flour and water. If you want bread that rises then yeast is needed to be added to the mix and let the dough rise.
A bakery will sell bread and other baked goods such as pies, rolls, pastries and cakes.
Bakers have to get up really early to get the bread process started, it takes time for the yeast to rise so they need to get a head start to allow time for everything to be ready in time for store opening.
Sourdough bread is bread that uses a sourdough yeast. This is a very traditional type of bread that has been eaten for many years.