I agree that unless you have the skills for short-time trading, long time trading in cryptocurrencies is a much safer option. And the main rule you have to observe is : DON'T BUY AT ALL TIME HIGH! The secret is to buy low and to sell high - and not the opposite!
Indeed, long-term trading is a good option when a lesser risk is taken into account especially for a new trader. Unless the necessities are already present for one to go on day trading, settle for the long-term while learning how the market works and wisely dealing up with the risk the world of trading entails.