But trading To do this we have to start trading with experience about trading otherwise we can never make a profit.
No one starts trading with experience. To get experience, someone needs to trade many times. However, it is a must to have sufficient knowledge before we start trading. We also must be ready with our mentality because it won't be easy to deal with market changes. If we have weak mentality, we probably won't stay a long time.
Yes, you are right, it is impossible for someone who is trying to trade for the first time directly to apply their experience, because experience is something that is obtained when we have done it. Except maybe learning from other people's experiences, and in my opinion that's not enough, because what other people feel will be different when we experience it directly. We will really gain experience after we trade.
This is different from knowledge, we can learn it at the beginning or even long before we actually start trading. However, this knowledge is usually in the form of theory only, when we want to test our knowledge with direct practice, we can first use a demo account.