It is smart to not put all your money just in Bitcoin because its price changes much which is making it risky for daily survival. Good plan is to have stable job that pays regular money to cover your living costs. Then you can invest more aggressively in Bitcoin to grow your wealth faster holding it for long run. Once you have much of Bitcoin i is wise to invest in other things too like stocks or property so all your money is not in one place. Since Bitcoin price swings wildly it is not safe to rely on it for your basic needs. It is better used as long term investment alongside more stable financial plans.