@Jolgan,
Cryptocurrencies : Im using exchange with no short sell.
Stocks : Im using brokerage with leverage, but i never short sell at stocks.
Forex : Im short at forex only
the answer is : only at forex
coinwide
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@DianKemala, lol, last year i didn't short crypto in the beginning, just sold off my spot coins, but then shorting got me good revenues.
Maybe you didn't go on short cause you had this or that coin, but soon i realized that i can go on short an take profit on the other side too and can keep that coin.
Puts'n Call are quite easier but who knows what comes to crypto...