What is the best strategy to prepare oneself before entering the trading market?
Read the basics > Read how to profits > Read the risk
Focus on the risks as that will be your challenge and problem when you enter trading. You won't understand it right away because you need to actually experienced it. Not discouraging you but in newbies days of a trader, mostly lose their money. Without it, they will never learn. That's what you need to take care of. Other lessons can be learned while doing trades regularly.
Trading will always have its own high risk and you should know how to deal with it. Because if you come into trading without knowing how risky it is, then you will only make frequent losses that is not really good for you, even with anyone else. I suggest that after learning all the basics in trading, start with a demo account first so you will know the reasons why you mostly fail and did not make any profits. In that case, you should start developing your own strategy that will give you an edge. And once you're done with it, then start real trading even with just a small amount of capital at first.