Raspberry Pi Foundation have launched a new product, Raspberry Pi 4 Model B on 24th June 2019. There have many major improvement and one of them, it is support dual HDMI monitor with 4K resolution. However, if you don’t want to use monitor, you still can remote Raspberry Pi 4 using Maker pHAT.
Please refer to the following tutorial first:
This video will show you how to remote Raspberry Pi 4 (with Raspbian Buster) Using Maker pHAT.
This is the sample code for Maker pHAT.