Indeed it is normal for a person to experience a loss when trading, and of course we can minimize that. And I think the only way is the accumulation of experience. When we have enough experience, our mistakes will be fewer, and that leads to fewer losses as well. Learning from theories alone won't produce any results, we need to practice and direct experience.
So my advice is to start trying and don't be afraid to fail. You'll find your own strategy in trading soon.