I hope what you mean is that you copy the link of that tutorial or you downloaded the source files because we don’t approve of people downloading the content of our tutorials without prior approval.
You can only download the downloadable files like the Source code of the project, not the tutorial text.
What are you exactly trying to achieve?
SPI is a data exchange mechanism. As one device sends a byte of data, so the other transmits one. You can also convert your integer number into bytes or strings then send byte per byte.