What stats are good when using a treadmill?

I know this varies a lot but I have been using the treadmill at the gym lately and I kind of understand what all the numbers are but I am sure I could use some more knowledge. I usually put it on manual and set the incline and speed then time for 10 minutes after it goes into cool down for like 3 minutes and then I do another 10–15 minutes at a faster speed and higher incline. My heart rate is usually around 140 at the highest speed/incline that I have been doing and usually it says calories: 130 by the end. I weigh 130 and im 23 years old – just looking for some tips or if I am doing anything wrong. I’m not a fitness guru so if you reply try not to get to fancy lol.