Soil Moisture Sensor Coding

Hi All,
I'm brand new at Arduino and Raspberry Pi. I have recently connected the Duinotech Soil Moisture Sensor to the Analog input of the Arduino Uno board ESP8266 but do not know how to display the data on my computer? My end goal is to connect it to Raspberry Pi 3B. Can somebody help me?

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Arduino Soil Moisture Sensor : 6 Steps (with Pictures) - Instructables