Its very important that you understand how AWS Free Tier works for new AWS accounts. First thing first, Free tier does not mean you can use any AWS service and there will be no charge for 12 months. Free tier provides you some services like EC2, EBS, S3 (with certain type or quota) to be used as part of Free tier. You should be careful with your free tier usage and must setup Free tier usage alerts as well aws billing alert. This is explained in detail in next video.

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~Chetan