Well you should study crypto currency each blockchain in that you can consider a coin will be to the moon, and I think that you should not only focus on one or two coin for long term investment, I suggest ethereum, xrp this next coin after bitcoin has the capability to make it's value more higher in just a matter of time, but all in all you should do it wisely and firmly.
Yes, I agree with what you've said. In order to gain more profits, don't just focus in only one cryptocurrency but be a flexible to all. Knowing blockchain technology of every coin that you will want to invest will help you to assure that your investment is in safe place.
Well, bitcoin is the most popular cryptocurrency but there are lots of altcoin that has potential like eth, ripple and verge.