1) Never goto sleep or turn your back on an open trade, always close out what you want to be holding, personally I hold btc.
2) Set a mental stop loss and never violate it. If the price goes above or below your stop loss, you were wrong, put your pride aside and close your trade for a small loss rather than a massive loss.
3) Don't get greedy, if you start to become shocked at how much profit you've made from a trade, it's time to close that trade. If you're feeling it, others already are and they're ready to buy back in which will wipe out all of your profits far more quickly than they took to accumulate.
4) Where possible use limit orders because they maximize your profits and provide you a bigger safety buffer if you're wrong.
5) Study study study. Learn how to analyze charts, volume, orderbooks, ema's, stochastics, macd, etc.
6) Risk / Reward. How much do you stand to lose on a trade vs how much you stand to gain. Only go in on trades that you deem an acceptable risk. 1:1 is not good enough as it's no better than flipping a coin.
7) Study up, if you only just learned what a wall is then you have a long way to go. Plenty of awesome guides on youtube and a lot of good books to read on the subject.