Here is a short list of commands on how to create a user in Linux and get started easily.
First of all login as root
Create a new user:
$ useradd <username>
Create a password for user
$ passwd <username>
Add user to sudo group:
$ usermod -aG sudo <username>
Create default user home folder:
$ mkhomedir_helper <username>
Edit default command line:
$ vi /etc/passwd
and replace /bin/sh with /bin/bash
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