[Question] Running on Arduino nano 33 IoT

[mfxuus]

Hi! I am fairly new to the Arduino world and have a few questions .. I have an Arduino nano 33 IoT, and tried running the example ReadSensors.ino.

• Is the sensor just the pins, or did I need to attach any special devices?
• If they are just the pins, how should I map the sensor ID to the pins? For example, if I run TOUCH.read(0), which pin should I expect sensor 1 (or 0) to be monitoring?
• I connected a few wires to a few pins on my nano 33 IoT (A0-A5), and by touching them I'm getting

23:03:50.173 -> Sensor 1 status: 1
23:03:50.173 -> Sensor 2 status: 1
23:03:50.173 -> Sensor 3 status: 1
23:03:50.173 -> Sensor 4 status: 0
23:03:50.173 -> Sensor 5 status: 0

but even when I stop touching them, these 1's seem to stay as 1s forever. Did I need to reset the pin readings or somehow discharge things?

Sorry for these amateur questions - and thanks in advance for any advice!