Wolfram can be used for free. I don't understand the exact limitations, but there is an browser-based Open Cloud version of Wolfram. (I would encourage you to use Google Chrome as I was having some issues with Microsoft Internet Explorer.)
There is a very helpful Elementary Introduction to Wolfram that is provided. That seems like a good place to start.
There is extremely good documentation provided.
Why might you want to learn about Wolfram? The blog post How to Teach Computational Thinking provides a good explanation.
To understand the sorts of things you can construct with Wolfram, check out Wolfram Alpha. Here are some money and finance related stuff.
Clearly you have to use your imagination a bit. But try and imagine what accounting, reporting, auditing, and analysis in a digital environment might look like.
If you create anything interesting in Wolfram please let me know.