How to clear Safari Cache on Your Macbook

First, select the first item Safari in the main menu and from the drop-down the item Preferences...

A popup opens. Click on the tab Advanced. Check the option Show Develop menu in menu bar at the bottom. Now you should see a new menu item in the main menu named Develop. 

If you click on the menu item Develop you can select Empty Caches from the submenu items. Then reload the site to clear cache.