We're always looking for ways to improve discoverability of our API and our reference/learning materials, so it would be really interesting to find out a little bit more from you on there being too much material online. It would be great if you could send an email (with a reference to this forum thread) to firstname.lastname@example.org so we can discuss this with you to find out what we can do to improve things.
With regards to the issue you're having, I notice that you are using an SChartNumberAxis - these are designed for numeric data, so the problem may be as simple as using an axis that isn't suited to the data. It looks like an SChartCategory axis might be a better fit to your use case - the categories being "Mon", "Tues" etc.
Let me know how you get on with this issue