Create a user and remove default pi user

# Create the new user first
sudo adduser "username"
# Give the user sudo permissions
sudo usermod -aG sudo "username"
# OR Give the user all pi user permissions
sudo usermod -aG sudo,adm,dialout,cdrom,audio,video,plugdev,games,users,input,netdev,gpio,i2c,spi "username"
# Switch user
su "username"
# set "username" as default user with
sudo raspi-config
# Go to -> System Options -> Boot / Auto login 
# Chose B2 and B4
sudo reboot
# SSH into new user
ssh "user"@IP
# Remove the pi user
sudo deluser -remove-home pi