You can make a perfect loaf of bread in a bread-making machine. You simply put all the ingredients; flour, sugar, salt yeast water and any flavouring such as walnuts, cheese or raisins, and the machine takes it from raw ingredients to mixing, kneading, proving, rising and cooking. The point about a machine is that the processes the dough has to go through are not subject to air humidity or temperature, or the clamminess of your hands - all of which can affect the quality of the bread once cooked. The machine takes out the opportunities for error too!
PS I am a bit of a breadmaking machine fan! They cost between �50 and �150 and you can buy them at most good department stores.
The salt simply enhances the flavour of the bread and you can add as much or as little as you like. The sugar element is more important as this is what makes the yeast active.