If you are already familiar with trading without leverage you have to only test out one of the demo leveraged trading platforms that some exchanges offer, for example BitMEX does have demo trading that you can test leverage trading using it before jumping into it with real money, there are a few things that you have to learn if you already have experience with trading without leverage, matters like: how much leverage works for you the best and the risk you're willing to take, and how to use stop-loss and take profit which are very important tools when it comes to leveraged trading, my suggestion is to never use anything more than 3x leverage for crypto trading.
In general, you shouldn't consider the BitMEX demo version as something to practice on. Never, under any circumstances. Because the demo mode has little to do with the actual trading behavior of a real exchange. Bargaining on the demo mode can give you a false impression of how the real market works and also false skills and false visions of trading. Therefore, it is better to immediately use the real exchange interface, placing orders at 1 dollar. Fortunately, the exchange allows you to place such small orders.
Having traded on a real interface for a small amount, you will really understand how the exchange works, how the exchange order book works in real conditions and how the chart is formed. Better to learn for a couple of bucks in real than learn for free on a simulator.