Hey, @Md Safwathullah,
As a Cloud Engineer, you will be working with crossfunctional teams which is a mix of software, operations, and architecture. This means when it comes to learning these skills, you would have quite a few options in your bag you can choose from. Here are some of the must-have cloud engineer skills:
1. Cloud Service Providers
6. Security and Disaster Recovery
7. Web Services And API
You can refer to this https://www.edureka.co/blog/skills-you-should-learn-to-become-a-cloud-engineer/ for in-depth information on Skills You Should Learn To Become A Cloud Engineer.
Click here https://www.youtube.com/watch?v=bWLFaG3Kcd8 to learn more about AWS jobs, salary, and resume to become a cloud engineer.
You can opt for https://www.edureka.co/masters-program/cloud-architect-training as you mentioned that you want to be professional in this field and get a job, so I would suggest you take up a certification course which will add more weightage to your resume.