I'm trying to write a code that takes in a tsv file and makes a bar chart, with words on the x-axis and numbers on the y-axis, but I don't know where to start. I have tried modifying pre-made codes but they are either too specific (only working with the data made for the example) or too general (Everything is put in by hand in the code itself, not by taking in a file). Any suggestions where to start?

I have a program which graphs an array of data. I want specific points to be a different color than the others. How do I go about doing this?

I am writing a program that graphs a set of data points from a spreadsheet. Now I need to connect the points using a continuous line. How do I go about coding this properly?

When using keyPressed(), is it possible to make a single key perform multiple functions (say 3 or 4) and if so, how?