You can create the services for free for a Month and your credit card won't be charged. When you sign up for a free trial, you get $200 balance and this balance will be used. Once this balance is over or a Month is over, your subscription gets expired.
Cost for each resource can be checked from Subscription > Cost analysis tab.
Refer -
https://video2.skills-academy.com/en-us/azure/cost-management-billing/costs/quick-acm-cost-analysis?tabs=azure-portal
https://azure.microsoft.com/en-in/free/free-account-faq/
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