How do I make sure that I don't incur charges when I use AWS services in AWS Free Tier?

Is there a way to automatically block using services that would not be covered in the free tier? For a topic title "make sure I don't incur charges", I don't see content here that actually answers the question of how to make sure I don't incur charges. Why can't there be selectors/menu items that say "Not included in free tier" or simply pop-ups that warn "Are you sure you want to use this resource that is not included in the free tier". I'm following a tutorial that uses resources that a listed in the free tier, and even billing seems to show that I am using resources in the free tier (did not reach/surpass free usage hours), yet I still am getting billed. Why?

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aws is unfortunately not transparent about this. Surprise fees come later. The fact that he did not warn when creating the order indicates that he is exploiting this issue.

Only Admin should be allowed to make these changes which are impacting billings / or there should be an approvals flow for the changes being made at AWS

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Lol. What a first week experience of having some random charges despite using free tier. I guess AWS just want to create a room for more cloud providers?

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So basically there's no way to have an ease of mind when Azure and GCP already provide this safety lock, cool. This is not the author's fault but more of a predatory practice AWS encourages. Imagine waking up one morning with a 10k bill just because someone tried to DDOS you on the free tier, even if support can reverse it, it's not something anyone wants to deal with.