Can't navigate between internal pages without refreshing page
I have one html document with several internal pages, but I can't seem to figure out how to navigate between pages without refreshing every time. It works one way (I navigate to the home page, I then am able to navigate to an internal page) but when I hit the back button, I can't open anything else.
I'm definitely a beginner when it comes to this, so I may need to be walked through this on a very basic level, if possible!
Thanks in advance for the help!