Thanks for your reply.
Do you have any idea if Binance has a demo account? I don't mean this
https://testnet.binancefuture.com because it is only for futures.
Please advice how to do test trades with margin.
You can test with very small money. To avoid troubles you can use one account for margin trade. It helps you avoid panic when your margin trades are in troubles and you will send all of your crypto to margin. In most terrible market, your order will be liquidated and you will lose all your money in that account.
As 4 year investors and traders I don't force you to use margin trades if you are in borrows, loans and don't understand the trade, formula of margin levels and liquidations.