Learned from my mistake in trading, i was loss alot of money because i did not use stop loss. So we should be use stop loss for every trade that we make, and use exchange that provide this feature. Crypto market is open all the times and we can not look in to the chart every times, so use stop loss and sell limit by the same times will make trading activity more profitable.
Well, that is usually what happens when we tend not to learn as much as we can when it comes to trading and then see it as a profession instead of a way to gamble which is what most people always see it as at first and then hoping that luck will always help them out in a lot of ways. Stop loss is always a very necessary part of a trading plan, which is one of the main reasons why everyone need a plan before even entering a trade, and that plan is based on your strategy on what you are looking out for to make a trade in anticipation of some possible movement. However, it is a market, shit happens and dealing with that shit when it happens is what makes you a good trader.
in my opinion saving a few coins that have good potential is a good decision, because if you only save in one coin, then the risk for loss is too large, whereas if you save in a few coins, if one coin decreases, you can still hope on another coin.
Most times even if you know that the coins you are holding have great potential, you won't have anything much to worry about. The thing about the market most of the time is that they tend to move at the same time. For instance, if we tend to see a bull market for the altcoins, it tends to cut across every single one of them and as long as they have potentials and not just some shit coins, it makes them an easy hold. However, I understand totally, the need for at least investing in different coins, to at least diversify the risk of future possibilities which is always a good thing.