Talking to random strangers online has the potential to turn dangerous whether you're using an Omegle alternative or an app like Facebook.
To protect yourself from scams and other issues, always abstain from sharing any identifying or private information with any of the strangers you meet online. Even if some of these chat platforms are heavily moderated, bots, scammers and other malicious individuals are still quite common.
Moreover, there's also the privacy issue to take into consideration as most of these services require camera access in order to function; only a handful offer just the text-based version. To protect your privacy, you can always opt to use a chat service such as ChatRandom (where you can easily hide your identity with a virtual mask) or Meetzur (which relies only on text-based interactions).
Such chat platforms aren't really recommended for younger users (under 18), as this might easily expose them to inappropriate content and online predators. Some of these apps do have a 18+ policy in place, but unfortunately this measure is quite easy to bypass.