Very good advice.
In fact, I think that everybody should understand that crypto market is the same as any other market, stock market, Forex etc.
It's very risky so please be careful before investing.
The best strategy, in my opinion, is to invest only money youcan afford to loose and to diversify your investment.
Right!
If invest all money to Bitcoin for long term, may be get good profit.
In any case can lose value/amount in fiat but amount coins of BTC are constant.