Hello,
1. The “Thank You Page”, also called Order Received Page in WooCommerce, is the page that your customers will see after form submission.
https://prnt.sc/_1JdksmELHej
The primary function of a default WooCommerce Thank You page is to thank your customers and show the details of the order that they have taken before that
2. The Instagram API will allow you to display your account photos on your website using our theme.
Here is documentation about it:
https://xtemos.com/docs-topic/how-to-setup-instagram-api/
The Google API will allow you to show the Google maps on your site.
Also, here is documentation on how to configure it:
https://xtemos.com/docs-topic/how-to-configure-google-login/
3. In general, the “Performance” tab is responsible for the correct site speed.
4. The below article describes in more detail how to use “White label”.
https://xtemos.com/docs-topic/how-to-rebrand-the-theme-white-label/
Kind Regards