What three steps are required when deploying changes via change sets?

Three steps that are required when deploying changes via change sets are:

Create the change set in the sandbox org. This is the first step where the administrator selects the

metadata components that they want to deploy and adds them to a change set in the source org,

which is usually a sandbox org.

Upload the change set to the target org. This is the second step where the administrator sends the

change set from the source org to the destination org, which is usually a production org or another

sandbox org. The administrator needs to have a deployment connection with the target org and

permission to upload change sets.

Deploy the change set in the target org. This is the final step where the administrator validates and

deploys the change set in the destination org. The administrator needs to have permission to deploy

change sets and resolve any deployment errors or warnings.

Verified Reference:

https://help.salesforce.com/s/articleView?id=sf.changesets_create_outbound.htm&type=5

https://help.salesforce.com/s/articleView?id=sf.changesets_deploy.htm&type=5