Unlike a Windows PC or Mac, Chromebooks don’t have a standard F5 key. Instead, they have a dedicated located on the top row of the keyboard.
Look for a key that shows a circular arrow (↻). It’s typically the 4th key from the left on the top row, right next to the "Back" button (which looks like a left-pointing arrow).
In most cases, pressing the Refresh button does exactly what you'd expect: it reloads the current webpage or file browser window. It’s the equivalent of clicking the circular arrow next to the address bar in a browser.