Depends if you’re able to be constant on a strategy that works for you and suits you. There are several strategies/options to choose from, you’ll have to get a bit familiar with the crypto trading world and try yourself to see what suits you. I consider buying/selling on speculations to be gambling. There are certain ways to narrow down risks if you look into it (it’s never risk free tho).
The most important two basic rules, in my opinion, are to remember to never buy high and sell low and never, ever get emotions involved with crypto trading.
eg. The lack of trust in BTC when it hit 3000. If you did some research for yourself then, invest some time, had bought some, you’d have more than doubled your investment by now. I’m not stepping in now, since I consider it to much of a risk, but there are other coins that you can research and determine if you’d find the risk of investing in them reasonable or not at this moment.
In general; (crypto) trading isn’t learned in 2 days time. All people that have a certain amount of success from trading have spent at least 6 months (if not more) trying to find their way into it, before they had a strategy that works and keep improving every day.
If you’re new to it, I’d suggest to make a free account on Tradingview.com. Pretend that you’re going to invest, set markings on the graph where you bought and sold, and keep track of it as time passes; You’ll discover if you’d made good decisions or not and can improve your strategy with no money involved. When you’re comfortable with it, you could try and do some real trading.
I’m no expert on trading, but I do some myself. This is from my point of view and I hope it contributed to your original question.
Cheers!