PCB Wiring Confusion

What do all of these mean and where should i wire everything.
I am a complete noobie when it comes to electrical stuff so i have no idea what 5v high or low means, let alone the other stuff.
Thank you.

I am reading hundreds of pages every day, to program several projects.

thank you very much

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Gameo is correct about high and low when concerning an input or output pin level on example a Nano. But in this specific case it refer to the way we can connect a WAS to the ads 1115. High is the normal signal input, and low would be used to connect the GND from an factory installed and powered WAS.

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I already found it in another topic. My board is covered in a layer of dust.
I will limit myself to the code.

This was helpful. Only problem I was having is the alliexpress links are not in English.

What kind of browser do you use? I get Dutch as expected. Only PET is not a home animal.