With the apps block, you can embed various third-party content directly on your website. With just a few clicks, your Calendly calendar, your Instagram post, or your Bandcamp album can appear on your website.
Depending on which apps block you choose, the way to get the URL for the integration differs.
In most cases, you'll be offered the URL to share directly, or you can simply use the address that appears in the browser's address bar. With most providers you will also find a Share button. After clicking this button, all you need to do is copy the link.
For a few services, like Google Calendar, some extra steps are needed to display the content publicly.
Please note that many services allow you to create private content. In order for it to be displayable on your website, it is important to make this content publicly available.