How to get the ID of a Lookup

Good afternoon,

I'm seeking guidance on obtaining the ID of a lookup. Attached is an image displaying the specific lookups for which I require the IDs.

While reviewing examples from the learning academy, I noticed that within the lookup, there are several columns including the name, ID, and others. However, I'm only able to retrieve the name of the lookup, not the ID.

Could someone explain me how to obtain these IDs? They are essential for integrating with a landing page.

Thank you so much in advanced.