Hello @zhao_li ,Welcome on Google Cloud Community.
Yep both terms might be confusing. Let’s split it:
* Free Trial = A 90-day period with $300 in credit ( credit covers any Google Cloud service you use, including Kubernetes Engine (GKE).)
* Free Tier = A set of free resources you can use every month without any charges. This includes small GCE instance, some storage, and a limited amount of data transfer. If you go over that quota, you will be charged.
Confusion:
Even if Free Tier is applicable each month, and it’s not charged against Free Trial, it doesn’t mean that everything is free. Most probably you’ve used some of SKUs, which are not included in Free Trial. I would recommend to check billing report and group by “SKUs”. Additionally, check “Cost table” tab and filter by project. It should show you detailed usage of each component.
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cheers,
DamianS
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