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That's right, when trading, but we don't see and feel market conditions directly then all the theory studied is useless, it's better when learning trading to immediately carry out trials using the capital money we have, don't use it all, use a little to study the market. Once we can understand the movement of coins in the market, we can increase the capital we use.
Only use some capital or allocate a small amount to practice, so you know how the market works and what strategies you should implement.
Many indicators can also support trading properly and correctly.
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If someone learns by himself then the next step should be putting money into useful coins for getting experience and checking how your learnt knowledge works and for it some amount of money is needed so I think take a start with little amount and learn well how to choose a coin which can lower the chances of your loss.
Self-taught learning is a choice, whether you want to advance or not by learning everything from scratch or basic.
But if you have a friend or teacher who can teach you trading, then just absorb the knowledge and try to do your own research and then apply it.
Some useful coins or top coins can be a good choice to start with, but choose one that has a fairly good volume, or you can try Bitcoin or the top altcoins, Don't get into a new project that has very fast fluctuations.