Because they have strong encryption, onion sites are safe in terms of privacy protection. However, as many onion sites feature illegal activity, it’s easy to imagine that they are more likely to contain malicious links, wrong information, scams, and generally content that you might not want to see.
As when visiting ordinary websites, stay alert to security risks on onion sites. Don’t click on suspicious links, be skeptical of what you read, and avoid dark web marketplaces if you don’t want to stumble on illegal activity or content.