Ok, you get your raspberry pi up and running but like any fresh install of raspbian, the default user is pi and the password is also default (and known by the entire community).
So, it’s time to change that user to your favorite username (and a new password).
Create a temporary sudo user
On the pi:
sudo adduser proot sudo usermod -G sudo proot
Now, log out and log in as proot.
Rename pi user and its home directory, set its new password
sudo usermod -l myfavoriteusername -d /home/myfavoriteusername pi cd /home sudo mv pi myfavoriteusername sudo passwd myfavoriteusername
Now, log out and log in as myfavoriteusername
Delete temporary sudo user
sudo userdel -r proot
You’re done. One step further in a more secure machine.