How can I send money through my phone?

Hello there, I'm curious about sending money through my phone. Can you walk me through the process step by step? Are there any specific apps or platforms that you recommend for this purpose? I'd like to know about the security measures in place to protect my funds, as well as any fees or transaction limits that I should be aware of. Is this a fast and convenient way to send money, and can I send it to anyone, regardless of where they are in the world? Thank you for your help!