Comment the following line in your /boot/config.txt (to disable this parameter):

# Enable DRM VC4 V3D driver
#dtoverlay=vc4-kms-v3d

And add the following line to your config:

# rotate screen
lcd_rotate=2
display_rotate=0

Firstly enable autologin and boot to desktop. Therefore you can use the raspi-config-tool:

sudo raspi-config

And then add the following line to the user's lxsession config:

@chromium-browser --kiosk --disable-pinch <url-to-open>

Sourced from: baldbeardedbuilder.com - Chromium in kiosk mode

To enable this “energy saving”-setting create a system service file under /etc/systemd/system/ with the name screenblanking.service:

sudo nano /etc/systemd/system/screenblanking.service

Then add this content:

[Unit]
Description=Automatic screen blanking
After=network.target network-online.target
 
[Service]
Environment=DISPLAY=:0.0
RestartSec=40
Restart=always
User=pi
ExecStart=/usr/bin/xset dpms force off
 
[Install]
WantedBy=multi-user.target

Finally save the service and enable it with:

sudo systemctl enable screenblanking.service

Partially sourced from forums.raspberrypi.com - know a command-line for turning off the screen?