Yes you can make daily income from your investment. Always investing money into those coins which is having highest volume.
For example Take bitcoin as example Bitcoin daily fluctuation is about 200-300 USD as an average from it you can make passive income.
But it is highly risky as well because crypto market is bullish and bearish.
No so sure if Bitcoin is best suited for trading, it is the least volatile of all crypto currencies, often just goes up/down by 1% or less. Trading is quite risky, you want to have a better risk-reward ratio than that in my view. I agree with the volume, that is pivotal.