Sidebar with menu style buttons

I am wanting to have my side bar on one page have a menu style to it. meaning I want the topics to show and when clicked it does not take you to another page, but just refreshes the content to the right of it.

for example, I want to have the left side bar to have things like this:

• Mission and Values
• Policies
• Trainings

Then if you click on one of the above, it will show the content to the right. and not take you to a new page