Of course investing in Bitcoin is risky, as is any investment which has the potential to give the level of return that Bitcoin does. In terms of keeping your investment safe, the following points might help slightly.
Bitcoin is as safe as any other asset as long as you safeguard it as much as you would anything else. Obviously the ways to keep it safe are different compared to traditional physical assets, but it is just as theft-proof (or not) as cash/cars/gold etc. The amount you own also reflects on how much effort you put into keeping it safe, same as the reason I wouldn't carry around $10,000 in my pocket, but happy enough carrying $50 for a night out.
Some quick tips.
* Only buy it from reputable exchanges (I like this review site, lots of options and graded on a number of factors
https://www.bestbitcoinexchange.io/).
* Double (triple) check any addresses that you are sending it from/to - one wrong digit/letter and it's unlikely you will see it again!
* Store it in a cold wallet that only you hold the private key for access (
https://trezor.io/ or
https://www.ledgerwallet.com/ are two well established and trusted wallets, but there are more out there).