Natalia, I don't know which part of the world you live in and I agree all these different flours are rather confusing. Plain flour is what you would use for pastry, cakes, biscuits etc. Bread flour is what you would use for bread - often called strong (plain) bread flour. Although I live in the UK, I buy Canadian bread flour which is harder and contains more gluten than the UK variety. Not sure what Baker's flour is (possibly pastry flour), so you may need to contact the member who uses baker's flour to find out what it is, although I have heard of it. For pizza bases I use a soft (tenero) Italian 00 flour, but there is also a 00 Italian 'semola dura' hard flour which I use for pasta and sometimes use in bread dough combined with the Canadian flour.Also remember that different flours react differently in different climates as well. It is a bit of a nightmare really JB
natalia, i do a lot of baking and there is no way i would use just one flour for everything.