Mickey he was trying to help you. Discus are expensive fish and harder to keep than many others. Considering the questions you have been asking, his suggestion you get more experience first is a good one. We would say it to anybody, not just to you because we think you are 'stupid'. This is not the case.
You can't have looked very hard if you could not find any information on water hardness. Just type 'hard and soft water in aquariums' into Google and you will find plenty of information.
Read http://faq.thekrib.com/begin-chem.html