- Invest the in gambling sites
- Buy new coins in IcO and sell at high price
- Do some trading with alt coins
- Stock the BTC and sell at high price, buy at low and repeat.
but each method has its own risks.
Trading is always the best option since every action that you take is carried out by yourself. With all the other options you mentioned, an other party is responsible for what's happening with your coins. This is something I at all times will avoid.
Without skills, people should stay far away from trading. But the reality shows that this isn't the case. People try their luck with altcoins and Bitcoin trading, but this type of trading isn't any different from gambling with your money. These people however don't realize that, or they simply don't care.
I don't agree because i believe that mistakes will teach you and also improve your skills, so if you are into trading or do trading and give your time to learn how to trade then you will have great skills, if you stay away from trading then how you get skills or knowledge about trading ? You have to take one time risk in any business or investment.