Hi @Isiah Mwongera , thank you for posting in Q&A forum.
To take the Course 55249-A: Developing with the SharePoint Framework, you will need to first find an individual Microsoft Learning Partner which is most suitable for you, then take the course from the third-party instructor.
If you are looking for related martials on this course, please refer to the links below for official documentations on SharePoint Development:
Overview of the SharePoint Framework.
SharePoint Development documentation.
Please feel free to let me know if I have misunderstood your requirement.
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