Trading is full of all kinds of risks. If there was such a thing as "safe trading" then everyone would be doing really well even with the fluctuations in the market.
The only "safe" way of trading is hodling and selling a big margin profit. This was possibly for the early adopters of bitcoin who had stocked up lots of coins and then sold them during the bull runs. Other than that you can still buy coins at low price and sell them at high price. Just the timing is essential and patience.
That's why it's so important to only invest what you are okay with losing because there is no security in the trading industry.
I dont know where you got this concept of "security" in trading. Its another investment and so there is risk on the part of the investor. Thus no security on part of the trader. If you want to trade you have to accept the risk.
Trading is a system of planning or strategies with the basic market rules of trading for the Bitcoin. As we know that every source has its own trading experience and this is due to difference among all the sources, Bitcoin is different from Ethereum and Altcoin and from other coins. We know that trading with these coins will result in different profits and all trading processes are sage if you follow the rules.