it seems that everyone should be considering at least getting off zero and probably allocating 5% to 25% of their quasi-liquid investment portfolio into bitcoin. .. and surely each person has to choose for themselves in regards to both the questions of whether to invest into bitcoin and if so then, how much
In Bitcoin If we use a good strategy and professional investment method, we can get good profit in short period of time, but the higher the profit, the higher the risk.
You're actually wrong, there's no strategy you apply in bitcoin investment that will bring profit within a short period of time except you want to gamble with your investment.
There actually is, and it's called shorting. From the word itself "short" that means an investor is expecting profits within a short span, contrary to holding long term. Most traders are doing this and that's one of the major causes as to why there is a short decline whenever bitcoin made a huge pump of over $1k or two. I think that's what the person you quoted meant about "the higher the profit, the higher the risk", I presume the risks involved how much capital you're willing to short. Nevertheless, bitcoin is a lot less riskier than any other crypto in the market today. Holding it for long term will almost guarantee a profit as long as an investor will not get affected by the price swings, especially during a prolonged bear market just like in 2018.