Start with a basic white bread recipe using flour, yeast, water, and salt.

By changing the type of flour to whole wheat flour you'll get a whole wheat bread dough.

If you use regular flour and replace the yeast with a sourdough starter you'll have sourdough bread.

Change the type of flour to rye flour, use sourdough starter, add molasses to the mix, and you'll have a basic pumpernickel bread.

Instead of molasses, do a mix of rye flour and regular flour, then change the sourdough starter back to yeast, and you'll have rye bread.

Instead of regular flour, use a high protein flour like bread flour, then boil the dough before baking and you'll have a bagel dough.

Use the basic white bread recipe, but add eggs, butter, and milk to the mix, and you'll have a brioche dough.

Swap the butter for sugar, and the milk for oil in the previous recipe, and you'll have a challah dough.

Using the basic white bread recipe, just increase the amount of water and you'll have a ciabatta dough.

Layer the increased water with a bunch of olive oil, and it becomes focaccia.

Bring the water level back down, leave the olive oil, and it becomes a pita dough.

Add yogurt and milk to the main white bread recipe along with a fat like neutral oil or ghee and you'll have naan dough.

Now keep the previous recipe, mix the flour with cornmeal, replace the yeast with baking powder, change the water for milk, add an egg, and you'll have cornbread.

Take everything away except for water, salt, and cornmeal (more specifically masa harina, which is cornmeal treated with lime water), and you'll have corn tortillas.

This goes to show that there are a lot of ways to make different kinds of bread with some simple ingredient substitutions.