Learning AWS online

Hi everyone, I want to learn about AWS to understand the architecture, the dashboard that is shown, some famous jargons like EC2, S3.. scaling as per the requirement, understand the cost and optimize it.

As a first step I watched and understood both of these below videos. Could someone guide through this in the further steps to take.

https://youtu.be/3c-iBn73dDE?si=R6jA44_VL1C4kyTN

https://youtu.be/X48VuDVv0do?si=Qh1L7UbX7hQHThZm