I would like to know how to connect my RPi 3 model B+ to my Samsung Galaxy s10e (sm-g970u) using WiFi Direct to use my smartphone as the display screen as i have NO internet access at my home and i can't turn on the TV at night because of the brightness and everyone's asleep. Is this even possible? Maybe a better solution? I also have a Lenovo Laptop i can use as the monitor display if that helps. Please help. Thank you guys & gals.
WiFi Direct is not specific to video: you will be running a multimedia protocol such as Miracast on top of it. There are a few projects out there, the most promising being miraclecast, though none of them worked for me (on a Pi 4). Perhaps you will be more lucky with your Pi 3.
Note that the opposite task (sending the video stream to the Pi) seems to be much easier.
You can use either SSH och VNC, depending on your objective and both ways has mobile apps.
VNC - Will give you a graphical desktop on your mobile phone.
SSH - will give you a command line terminal on your mobile phone.
Just remember that SSH needs to be enabled on your raspberry pi, use
raspi-config for that task.