I know we have few components for s3 in talend but is there a functionality in talend to do s3 tagging?
Here exists a new feature jira issue about "Tracking influence for AWS connectors (AWS S3)".
Could you please have a look at it to see if it is what you are looking for?
Do you mean how to add a tag to a S3 bucket?
If so, this link may help https://docs.aws.amazon.com/AmazonS3/latest/API/RESTBucketPUTtagging.html