AWS is overwhelming.
Start by learning the core services. Other things build on top of them, so the concepts will make more sense.
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EC2 - launch virtual machines (compute instances)
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VPC networking - how to setup a secure cloud network using subnets, security groups, NACLs, routing tables, etc.
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IAM - how to manage users, groups and permissions granted to access resources
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S3 - object storage
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Cloudformation - templates for launching any AWS resource
Then:
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Load balancers (ALB / ELB)
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RDS for cloud databases
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Route53 for DNS
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Secrets Manager for safely storing credentials
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ECS for launching docker containers
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ECR for storing docker images
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EKS for kubernetes clusters