ELI5 Airport Runways - how are they numbered?

ELI5 Explain Like I'm 5: Bite sized answers to stuff you should know about - in a mini podcast

What do all the signs on an airport taxiway mean? What do the various markings and lights indicate? How are parallel runways numbered? Why does Atlanta Airport use an alternative NATO Phonetic Alphabet?

... we explain like I'm five

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