Start with the Youtube videos for clearing your concepts on Cloud Computing technologies.
After having a brief idea about Cloud Technology. Start with Youtube AWS channels they have the best videos and will clear all your doubts. If you are confident enough then make a free AWS account and apply all the concepts learned while watching videos.
Buy a course from Edureka or Linux Academy apply those concepts also on AWS console with your account.
Start with giving a certificate AWS certified Cloud Practitioner. Join a company and learn some new concepts. You can also get many reading materials and case studies from the AWS website.