My personal rant: There are not many ways to subnet. This is an extremely popular misconception. There is just the way there is. Ultimately, once you understand subnetting and can visualize how much space there is across a network topology diagram, you will be able to see the subnet masks and have access to this understanding without calculation.
Subnets can be thought of as visualizations of how much space there is. This space can be used to store data or numbers.
There is still only one way to subnet.