BTC is an investment. its same like equities i mean share market. if u r investing in equities, u know this easily. u have to just know how it works & how its price goes up & down & by that u can trade with it.
buy & sell is the best thing to get more benefit from it but for that u have to find a secure place where u can do this easily & safely otherwise it may possible that instead of getting benefit, u lost whatever u have invested.
so its better to understand about Bitcoins & how it works then invest. that is why i told its same like equities. without knowledge any investment can make u looser. so get knowledge, gather information, think & then invest. proper knowledge & timing can give u good returns.