The target may be daily, monthly, or yearly, and the tool may create a list for you, including providing advice on what you want to achieve. (The entrance to the tool is located at the top of this page.)
You may be able to persist in something, whether it's a habit, a belief, or simply buying shares of a corporation. The tool may provide points to persuade you to persist in them.
You may find some answer from the article What is the Prayer Farm, or some supplementary information in the About page.
Some common questions is put in the FAQ page, you may find the answer there.