Beginner wanting to do a project

I am currently wanting to do this and have the hardware but have no idea how to code this. Could someone walk me through? https://www.bareconductive.com/make/building-a-capacitive-proximity-sensor-using-electric-paint/ I have the physical setup but do not know how to code it or even opening files on an arduino sketch.

That tutorial includes links to all the files you need (after downloading the Arduino IDE.)

But before you do that, just check that you can upload the Blink sketch to your Arduino. Change the timing numbers so you can be sure that it’s your sketch and not the one that came on the Arduino. Change the numbers so you get a different pattern of blinks.

Then play with some other sketches from the examples folder. See what interests you. Make a change to each one, like make it print your name or something.

Now you are an experienced Arduino programmer, you can try the sketches and libraries downloaded from that tutorial.