An intranet is like a secret website that only people in your company can access. It's like a big box of secret information and tools that can help the people in your company work better together.
Intranet strategies are plans for how to use the intranet to make the company better.
For example, if a company wants to use the intranet to help people work together better, they might have a strategy to create special pages where people can share ideas and files with each other.
Or if a company wants to use the intranet to save time and money, they might have a strategy to put forms and tools that people use every day onto the intranet so they can be filled out and accessed online instead of on paper.
Overall, an intranet strategy is just a fancy way of saying a plan for how to use the company's secret website to make things better for everyone.