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Hi,
Vertical scaling - add more cpu/memory to the existing VM.
Horizontal scaling - add more VMs, spread the load using load balancer between them.
Wordpress is not ready (by default) to scale horizontally. Depends on the plugins it may store some data on the local filesystem. If you still want to scale it horizontally you need:
- Configure media storage to the S3 (plugins) or shared EFS, which will be mounted to each VM
- Configure EFS for all other locally stored data
- Understand how would you update your WP (not via UI)
You can start from here https://aws.amazon.com/tutorials/launch-load-balanced-wordpress-website/, even it's Lightsail the principles are similar.