'How can I start reading Leaflet Source Code? [closed]

I would like to learn more about leaflet so I can be confident as I am building stuffs. I have never read source code for a project as big as Leaflet. How could I get me started ? I tried to find the definition of L, I didn't find it. Is there any file which would be considere as the first one ?

Here is the github of the project https://github.com/Leaflet/Leaflet

Thank you



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