Ansible + Terraform + Billing Alerts. These three things are big helps to control what resources are used, how, for what reason. Then Billing alerts notify when expenses reach projected levels. This has saved others, it has saved me, and it can save you; from leaving resources running and payig through the nose for it.
Also, AWS has a 'free tier' for the first year. It amounts a a server computer, small database server, and basic file storage.
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