Billing chargee

You really should consider doing research before making assumptions. Free Tier eligible products are only limited to a subset of AWS services. Similar to any other action in life, do your research before taking action. Also, check your AWS bill and Cost Explorer to see what you are being charged on. Again, do you research to think about how you will be monitoring before you start any software engineering project.

Different services offer different free tiers and trials. It's possible that you have created some resources that don't fall under free tier or trial. I would suggest you take a look at your monthly bill as it should give you a detail view on what is incurring charges?

https://aws.amazon.com/free/?all-free-tier.sort-by=item.additionalFields.SortRank&all-free-tier.sort-order=asc&awsf.Free%20Tier%20Types=*all&awsf.Free%20Tier%20Categories=*all https://docs.aws.amazon.com/awsaccountbilling/latest/aboutv2/getting-viewing-bill.html