They're just little side stories. Here's a very basic summary of them.
Blind Alchemist--Ed and Al meet with a blind alchemist and the family that he works for.
Simple People--Why Winry pierced her ears and Riza grew her hair.
Tales of the Master--Izumi's training when she was a young alchemist.
Yet Another Man's Battlefield--Roy's time in military academy.
I don't know what's real from the noise, the noise.
I can't hear a thing for the noise, the noise.
I wouldn't do anything, the thunder that throws me away.
I wouldn't do anything, there's something that keeps me away.
I wouldn't do anything, something that begs me to stay.
I wouldn't do anything, something that throws me away.