This is a really simple question but I'm new to the whole thing. How would I use the water level sensor which is shown in the shopping guide? I understand that it's analog but I'm not completely sure how I'd write the sketch. Thanks!

I'm having issues with the LED setup as shown on the page. The LEDs are just constantly on even though everything looks like it's setup just like the picture. I'm new at this so I could be doing something stupid.