Trading is not the same as investment, both are risky but trading is riskier. For anyone that wants to be a trader, my advice is to never depend on it, start small and use the amount of money that is lower than the amount of money that you can afford to lose to trade. If you continue to trade, you will know which step to take depending on how trading favours you. But just like gambling, never rely on trading, although trading is not gambling.
Yes you are right that as compared to trading the investment is very risky so instead of losing money through trading you can select a coin which will be less risky and invest money for longer time. Trading is better as a part time job but depending completely on trading will be risky and with passage of time when you get experience through ups and downs you will definitely be a winner as you will be familiar with all rudiments of trading and investment. Doing another business if one do not have any job and then use little amount for investment or trading will be better idea but do not make huge trading by using overall money.