How to find transaction ID?

Hello there, I'm curious about something related to cryptocurrency transactions. Could you please guide me on how to find a specific transaction ID? I've made a few transactions but I'm having trouble locating the exact IDs for them. Is there a specific platform or tool that I can use to search for these IDs? Also, if you could explain the process step-by-step, that would be incredibly helpful. Thank you in advance for your assistance.