enter image description hereI didn’t use that api now i am learning how to use that api and current quota is get expired . I want to use it as free until i am learning

I want to know about this credits
error code: 429 – {‘error’: {‘message’: ‘you exceeded your current quota, please check your plan and billing details. for more information on this error, read the docs: https://platform.openai.com/docs/guides/error-codes/api-errors.’, ‘type’: ‘insufficient_quota’, ‘param’: none, ‘code’: ‘insufficient