S3 event notifications are designed to be delivered at least once. For S3 to be able to publish events to the destination, the S3 principal should be granted the necessary permissions. S3 can publish events to the following destination. for replication configurations that have S3 replication metrics or S3 Replication Time Control (S3 RTC) enabled. Can be used to reproduce/recreate the Object. Reduced Redundancy Storage (RRS) object lost events. restoration of objects archived to the S3 Glacier storage classes. You will not receive event notifications from automatic deletes from lifecycle policies or from failed operations. Can public delete events for object deletion, version object deletion or insertion of delete marker. You will not receive event notifications from failed operations. Can be enabled for PUT, POST, or COPY operations. 
However, filtering rules cannot be defined with overlapping prefixes, overlapping suffixes, or prefix and suffix overlapping Notifications can be configured to be filtered by the prefix and suffix of the key name of objects.Notifications are enabled at the Bucket level.
S3 notification feature enables notifications to be triggered when certain events happen in the bucket. S3 stores this information in the location subresource and provides an API for retrieving this information. AWS region needs to be specified during bucket creation and it cannot be changed. AWS can generate a cost allocation report with usage and costs aggregated by the tags applied to the buckets. Cost allocation tags can be added to the bucket to categorize and track AWS costs. S3 provides the tagging subresource to store and manage tags on a bucket. S3 Access Logs can be analyzed using data analysis tools or Athena. Logging can be enabled on multiple source buckets with the same target bucket which will have access logs for all those source buckets, but each log object will report access log records for a specific source bucket. S3 periodically collects access log records, consolidates the records in log files, and then uploads log files to a target bucket as log objects. Access log information can be useful in security and access audits and also help learn about the customer base and understand the S3 bill. Each access log record provides details about a single access request, such as the requester, bucket name, request time, request action, response status, and error code, if any. S3 Access logs are disabled by default. S3 Access Logs enables tracking access requests to an S3 bucket. CORS configuration rules identify the origins allowed to access the bucket, the operations (HTTP methods) that would be supported for each origin, and other operation-specific information. With CORS support, S3 allows cross-origin access to S3 resources. CORS allows client web applications loaded in one domain access to the restricted resources to be requested from another domain. All browsers implement the Same-Origin policy, for security reasons, where the web page from a domain can only request resources from the same domain. Refer blog post S3 Permissions CORS (Cross Origin Resource Sharing) Refer blog post S3 Object Versioning Policy & Access Control List (ACL) Any request to such a bucket will receive a 403 -Access Denied response Requester Pays buckets or DevPay buckets do not allow access through the website endpoint. If the bucket contains objects not owned by the bucket owner, then public READ permission on those objects should be granted using the object ACL. 
Bucket policy applies only to objects owned by the bucket owner.Users can configure the index, error document as well as configure the conditional routing of an object name.For S3 website hosting the content should be made publicly readable which can be provided using a bucket policy or an ACL on an object.S3 website endpoints do not support HTTPS or access points.S3, in conjunction with Route 53, supports hosting a website at the root domain which can point to the S3 website endpoint.
S3 does not support server-side scripting. S3 can be used for Static Website hosting with Client-side scripts. Refer blog post S3 Object Lifecycle Management Static Website Hosting S3 supports various options to configure a bucket f or e.g., the bucket can be configured for website hosting, configuration added to manage the lifecycle of objects in the bucket, and to log all access to the bucket. they do not exist on their own, they are always associated with some other entity, such as an object or a bucket S3 Subresources are subordinates to objects i.e. S3 defines a set of subresources associated with buckets and objects. S3 subresources only exist in the context of a specific bucket or object. S3 Subresources provides support to store, and manage the bucket configuration information.
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