Hierarchial IP addressing scheme

So i’m working on this task, And i’m just wondering if there are any tutorials or lessons on htba that could help me to complete it.
Below is a snippet of the task i am working on completing.
If someone could point me in the right direction to any tutorials that would be much appreciated thank you.

[Design and describe a hierarchical IP addressing scheme for an enterprise network with the following features:
• 10 departments
• Each department has a maximum of 100 staff
• Makes use of a private class B IP allocation]