Hello,
I would suggest starting with Microsoft official learning with self study course, although it's just the text version, it's very helpful and will build a solid foundation for you. And when you are prepared, try to take the exam and get the certification to prove your skills.
For Azure Admin, please follow this link: https://learn.microsoft.com/en-us/training/courses/az-104t00
For Entra Admin, please follow this link: https://learn.microsoft.com/en-us/training/courses/sc-300t00
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