How do you actually find reliable travel companions?

I've met many travelers who say they'd love to travel with like-minded people, but finding someone reliable is often harder than planning the trip itself.

I'm curious how people here approach this:

• Where do you usually find travel companions?

• Have you had any great (or terrible) experiences?

• What signals help you decide whether someone is trustworthy?

• Do you prefer meeting through communities, social media, apps, or in person?

• What information do you wish you knew before committing to a trip together?

It feels like compatibility, reliability, and safety matter much more than simply sharing the same destination.

Would love to hear how others solve this problem.