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New Pi password

passwd

New root password

sudo passwd

Config

sudo raspi-config #change gpu, hostname, password, TZ
sudo apt update
sudo apt upgrade -y
sudo reboot now
#(sudo apt update && sudo apt full-upgrade -y)

Check RAM & SWAP

free -m

Remove Pi user

sudo adduser steph
sudo adduser steph sudo
sudo cp /etc/sudoers.d/010_pi-nopasswd /etc/sudoers.d/010_steph-nopasswd
sudo chmod u+w /etc/sudoers.d/010_steph-nopasswd
sudo nano /etc/sudoers.d/010_steph-nopasswd (replace pi > steph)
sudo chmod u-w /etc/sudoers.d/010_steph-nopasswd
sudo reboot

Then login as your new user

sudo deluser -remove-home pi
sudo rm -vf /etc/sudoers.d/010_pi-nopasswd)