As a trader my main system is arbitrage trading. Its quite simple way to trade crypto by finding a large enough difference on buy and sell prices on the exchanges. I started using Newscrypto.io arbitrage feature that shows me the best buy and best sell order on reliable exchanges. For now, it saved me a lot of time and all info given was dependable.
This seems to be the site that I will be visiting soon in the near future because buying and selling spreads can help you a lot in making extra money. I do not know how to use it yet, but I will start researching this form to create the best profit for me. Anyway, this is a way of trading that many people are interested in and will certainly be a new trend in the future. I think if you can do this then you don't need to invest because this is the easiest way to make money