Hi there!
Your best place to learn with Amazon Web Service is of course on their own website with all the documentation available and many free certification.
https://aws.amazon.com/fr/training/
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I've done 2 of them so far witch is:
Amazon AWS certified Data Analytics - Specialty
(This one took me couple of attempts to be successful and about over 60 hours to study)
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Amazon AWS IoT Foundation: Telemetry
(This one took about 5 hours and was not so hard)
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You can also find some Amazon Web Services certifications on Coursera and many other place, like this one here I am doing:
Building Modern Python Applications on AWS
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I hope this will help you! Good luck to becoming successful with AWS!