Trading requires putting your coins at risk, where just keeping your coins in offline storage is basically a *risk free* form of investing. If you look at how the price developed in the last year(s), then it's safe to say that holding your coins for a semi-long period of time is more than rewarding. In that regard, it's not necessary to focus on trading or investments. Especially in cases where you don't like to take unneeded risks, and lack proper understanding of the market.