Errr long term suggests a larger margin for profit.
Not necessarily, although you can certainly earn a better profit if you do use margin. Personally I never did, because I really don't like borrowing money in order to trade. Using leverage is not without risks, and in fact it could be a huge risk. What do you think wiped out all those traders in the 1920s in the stock market? A lot of stocks were bought on margin and many people couldn't make their margin calls when stocks started to drop.
To op, I would recommend just using a buy and hold strategy and to buy *now* while most coins are selling for cheap prices. You really just have to pick the right ones, and the rest is just being patient. Not sure what you're studying, but if it's technical analysis, ie, chart reading, be careful. The best investors are the ones using fundamental analysis, and that's true of many markets.