Welcome to gimp-forum.net however please to not post in capitals, it is considered SHOUTING and rude.
see: https://www.gimp-forum.net/misc.php?action=help&hid=9
For right-click on the text layer you get the selection from the entry right at the bottom Alpha to Selection
screenshot https://i.imgur.com/jeNUh9O.jpg
It is the same as menu Layer -> Transparency -> Alpha to selection.
There is another way using layer masks
https://www.gimp-forum.net/Thread-Cut-Out-Text with a demo video
see: https://www.gimp-forum.net/misc.php?action=help&hid=9
For right-click on the text layer you get the selection from the entry right at the bottom Alpha to Selection
screenshot https://i.imgur.com/jeNUh9O.jpg
It is the same as menu Layer -> Transparency -> Alpha to selection.
There is another way using layer masks
https://www.gimp-forum.net/Thread-Cut-Out-Text with a demo video