Event listener question

https://codepen.io/Adhurim-Gashi/pen/eYqZzRo

- Hey guys, I am building a little calculator project with a tutorial for the (js) so in my js code whenever i click a button i get the console.log of the characters or numbers inside the calculator, and can someone decipher how those lines of code for me, cause i don't understand it that much, thanks.
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