What does the “pending” state mean in EC2? Can you access the instance during this time?

In Pending state means its not assigned with any server similar to stopped state so we can't access SSH/RDP when the instance in pending state.

What is the highest root volume for windows instance ?

What is a Dedicated Instance in AWS?

Dedicated instance it reserves a dedicated server for a single AWS account, but we don't have control over the physical server, dedicated instance charged based on instance usage based

What is the command to change the working directory using relative path in Linux?

the short answer absolute path means it not in the present working directory, its refers complete path i.e /root/user/downloads/test.py, where the relative path refers the present working directory [pwd ] files are present in the current working dirctory

What is the command to change the working directory using relative path in Linux?

In linux we could use the Change directory[ cd ] command to change the working directory
Syntax: #cd /path/to/change