Help with sliders

I don't see the bar graphs change in your three screenshots, but the concept would be exactly like changing the state of the character: You could create an object with custom states for each of the five bar graph columns, or you could create one object with custom states for the entire graph. Then, based in the changing slider variable you can change the state of the graph object(s).

The graphs are not changing currently cuz I couldn't figure out how to do this. I'm totally new to this so I don't even know what kind of objects the bar graphs need to be. They are currently just individual rectangular shapes. Do I need to use variables for this operation? 

See attached a quick example that hopefully illustrates how this might work. I added a simple rectangle shape as one additional bar. This shape has custom states, Worried, Neural, Happy. I use triggers to change the state of this object based on the slider variable. 

Thank you so much, Michael! I think I've found the tutorials I need to watch to understand how variables work. Hopefully I can figure this out on my own shortly :) 

I've figured out how to use "states" to display the different bar graphs when the slider moves. But I'd like to move not just within the 3 steps, but instead have the bars move smoothly and gradually as the slider moves. The first example that David shows in this video is what I'd like to do:
https://youtu.be/LoHAn2kaAdc

Is there a tutorial that is more specifically on how I can accomplish that? Thanks!

It' the same principle as with 3 steps, just add more states to the bar objects, add more steps to the slider, and add additional triggers that correspond to the added slider steps.