Crypto can be a profitable world, but also one that punishes mistakes faster than traditional markets. Before your first trade, it's worth stopping for a moment to make sure a few basic rules are in place.
First, invest only money you can afford to lose. Crypto is volatile, and volatility goes both ways. Second, don't put all your money on one coin or one trade. Diversifying among several assets reduces the risk that a single mistake will bring you down.
Third, enable two-factor authentication on every account connected to your money, and never share your access details with anyone, including anyone posing as technical support. Fourth, check the license and regulation of the platform you're trading on - not every exchange in the world is subject to supervision.
Fifth, don't chase a "once-in-a-lifetime opportunity" under time pressure, and before buying something you haven't heard of, check what's behind it. Sixth, learn to read a basic chart before trading actively - you don't need to be an expert, but understanding what you're looking at does matter. And finally, if you're not sure, start small. You can always increase later.