Excel charts
Once upon a time I was asked to explain how I got my charts, using MS Excel.

I'm no expert on Excel, but I generated a tutorial nevertheless ... in the form of (what else?) a spreadsheet.

A piece of one of the pages looks like this:

Click here to download the spreadsheet tutorial.

P.S. Here's a chart from the test, at the end of the tutorial:

There's also a tutorial (in the form of a spreadsheet) of more basic stuff.
It looks like this:

RIGHT-click here and Save Target to download the .ZIPd tutorial.