Ok i can cook but i don't bake. Whenever i try to bake I never seem to have the right sugar for the recipe. Today i wanted to make a cake, the recipe says caster sugar, in my cupboard there is soft brown sugar. Is that the same? 
Whats the difference between white sugar, dark brown, light brown, caster, moscovado (sp?)etc. What can you replace and do you change the ammount? Any rules to make it clear and simple?
Thanks