When you are eager to start trading, exactly, understanding at first what you want to do is very essential. In this case, understanding at first about Bitcoin (and cryptocurrency generally), and also about trading.
Actually, there are many sources from trusted YouTube and websites on the ways to trade. And every exchange will also provide the ways of trading.
There are also several types of trading that you should know. And as a beginner, I will suggest you learn from spot trading.
can Bitcoin trading profitable without having lost?
No guarantees. This is the basic that you must remember, trading will not guarantee you to always take profits or win. Trading always involves risks, and one of the risks is loss. Even a professional trader, sometimes, he will also lose in trading. So, never think that trading Bitcoin is always taking profits.
But, if you want to do fewer risks, holding Bitcoin may be fewer risks. And you can still hold your BTC if the price is still low and then take the profits when the price has reached the price that you target. But once more, no guarantee, imo.