Do not be greedy? Learn from your own mistake? It sounds like Biblical Commandments. The first tip for successful trading is to stop spending time on forums and start proper self-education. Any trading is way more complex than "don't be greedy," especially if we talk about crypto trading (which is basically 50% skill, 50% luck). I would advise beginners to start practicing on forex trading platforms to get some experience. You can switch to cryptocurrencies as soon as you start making good profits out of fiat money.