PUT/COPY/POST/Delete v/s GET/HEAD requests

PUT/COPY/POST/Delete are your write actions. PUT requests-in this case for S3-uploads objects; COPY is self-explanatory; POST request is used to send any data(includes file uploads) to your S3 endpoints via HTTPs, and Delete is also self-explanatory. In S3, any action that has Put and Delete in the name uses the above HTTPs requests

GET/HEAD are your download actions. GET request grab contents from S3(think of downloads). Any download you perform from S3 has a Get method behind the scenes in the API call; HEAD does the same above but only reads the headers in the request. In S3, any action that has Get* has the above HTTPs requests.

Refer to this doc for S3 actions: https://docs.aws.amazon.com/AmazonS3/latest/API/API_Operations.html
Refer to this doc for HTTP request methods: https://developer.mozilla.org/en-US/docs/Web/HTTP/Methods