Available resources are usually one of the first questions asked when looking for hosting. This is because traditional web hosts use (often misleading) marketing and sales copy to sell their services.
Each install includes a default of 1GB RAM, 10GB storage, 2 CPU shares, and 100Mbps bandwidth.
Because every container only does one thing (running WordPress, and nothing else) you’ll see that in the large majority of cases a container will be extremely efficient and can handle lots of traffic whilst only using a small amount of dedicated RAM and CPU cycles.