Which linux distro to learn?



Hello everyone, i'm new to linux and i'm willing to learn linux and maybe get a certificate like lpi, i'm very excited about learning linux and hoping for IT career in linux, System administrator maybe, just wondering which distro (desktop) should i start to learn for the more popular and have a common package management and running commands, currently i'm confused between two (Ubuntu, Fedora) So would you please advice!
Thank you.

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