Yes knowledge is the essential part of Forex trading. Without knowledge we can not succeed in Forex. So every trader must learn about Forex to make good progress in Forex. Demo account is a good way of learning. Every starter should start trading with Demo and should for at least six months.
Trading without knowledge will make us like walk in the darkness without light. We must know that knowledge is the key for us to be able to do something well, including forex trading. And demo account is surely used by beginners to understand about forex trading.