Calculator input help

Calculator input help
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#1

I honestly never thought I would make it this far in freecodecamp but i am glad i did. I am not done yet but i am feeling kinda lost and I need some guidance like what am I supposed to do next? I know I need to add click events but how any help would be useful thank you all. Also I really want to know what the value part on the button tag is ex, 7

My project so far: