1. Note that Bitcoin transaction are irreversible. Therefore one need to be extra careful while doing transaction.
Confirmed transactions are irreversible. Nevertheless, transactions that have not been confirmed can be Replaced by Fee or Double-Spent. This is why you need to ensure there is at least one confirmation before releasing your funds or goods in any Bitcoin transaction.
2. The price of Bitcoin is still volatile i.e it does not have a fix price for it market price.
Bitcoin price is the most stable in the crypto space. You cannot compare its volatility with the prices of altcoins. Even some country's fiat currency is more unstable than Bitcoin. Anyway, it is important to tell newbies that the price is highly unstable.
3. It requires your own effort to protect your Bitcoin.
The security of your coin depends more on you than any other party. This is why it is not recommended to keep your Bitcoin in centralized platforms such as exchanges or other custodian services.