Without a home directory
sudo useradd myuser
With home directory
sudo useradd -m myuser
Then set the password
sudo passwd myuser
Then set the shell
sudo usermod -s /bin/bash myuser
Without a home directory
sudo useradd myuser
With home directory
sudo useradd -m myuser
Then set the password
sudo passwd myuser
Then set the shell
sudo usermod -s /bin/bash myuser