Unable to understand certain Cloud Storage cp command

Google Cloud Compute Infrastructure
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1

In the following page/section:

https://cloud.google.com/load-balancing/docs/https/ext-load-balancer-backend-buckets#copy-file

What does the following command signify:

gcloud storage cp gs://gcp-external-http-lb-with-bucket/three-cats.jpg gs://BUCKET_1_NAME/never-fetch/

  1. What is gs://gcp-external-http-lb-with-bucket/three-cats.jpg. Where did gcp-external-http-lb-with-bucket come from. there was no reference to it in the tutorial.

  2. Why does BUCKET_1_Name has the suffix /never-fetch?

I am looking at the following cp reference documentation as well, but unable to quite understand.
https://cloud.google.com/sdk/gcloud/reference/storage/cp

2

The bucket name gcp-external-http-lb-with-bucket is likely a placeholder or example name (bucket name should be globally unique) used in the documentation, and it may not be explicitly referenced elsewhere in the tutorial. The name never-fetch of bucket prefix is arbitrary and could be used to organize files or indicate that the files in this directory should not be accessed frequently.