It’s a pity that the people who write browsers don’t set the default home page to something useful. This is how you change the default homepage from Apple to one of your choosing in Safari for Windows.
Click on Edit then choose Preferences
Here you can change the default homepage from Apple’s default. Just clear out the address in the Home page box.
If you want to set the current page you are viewing as your default homepage click on the button Set to Current Page. You will get a confirmation screen. Click the Change Home Page button.