We don't say that everyone can just come and predict. This process requires experience, a lot of years of experience. The article shows it is possible, of course not all of the methods are very popular nowadays because they require not only the experience but the development of some additional programs.

The cryptocurrency market is developing, that is why there appearing more and more ways to get profit. Some of them are easy and can be used by newcomers, and other ones are only for professionals because they require a lot of experience and are a bit risky.

To start with, you need to know that when investors short sell bitcoin on a crypto exchange, they sell a Bitcoin they don’t possess. To do that they borrow bitcoin from exchange margin lenders, while the position is open.
 
The whole point of going short on Bitcoin is to sell the asset with the hope that it will be redeemed soon for a lower price.
 
Here is an example: you sell borrowed Bitcoin when the price is $10,000. The price drops to $8,000. You repurchase the Bitcoin for $8,000 to return it to the lender.
 
And you make $2,000 ($10,000 - $8,000) out of thin air!

We have some more ways to short Bitcoin, so if you are interested in getting more information, check this article - https://safetrading.today/blog/how-to-short-bitcoin/