when you do trading, do you always think about this, "buy some, sell some, hold some."
I don't understand your strategy that buy some,sell some and hold some.Are you talking ablut bounty rewards?
You really need to follow biy low and sell high if you want the profits.
He was probably referring to bounty rewards and not about trading. If he was actually referring to bounty, then this can be a very good strategy. Even I do the same with my rewards. I sell some and from that amount I purchase some BTC/ETH. And I keep a small part of my bounty for long-term.