Every investment is risky.Bitcoin also comes under the same category.Bitcoin price is determined directly by the increase and decrease in the demand for bitcoins.So if the demand decreases,bitcoin price may fall.Since bitcoin works on a secured block chain system,our investment is safe.But when storing bitcoins in your wallet,you should keep your private keys safe.Otherwise,you may not get access to your bitcoins.But in future,for nearly after twenty years,when quantum computing will be introduced,our bitcoins security may get compromised.