the reason you are getting mixed information is because there are 1000's of ways of feeding rabbits in a healthy manner.
You need to remember your rabbit is a HERBIVORE. Think rabbit when you feed a rabbit (as opposed to thinking People)
That means you concentrate on green food: grasses, dandelions, carrot tops, various herbs (not all),
You give sparingly things like apples and fruits. NO NUT FRUITS!
You "woody" materials like raspberry canes, apple branches, etc.
How much you give depends on your feeding regime and your rabbits tolerances.
If you feed predominately green food then you'll feed more. If you feed a pellet based diet you'll feed less.