Running RealVNC Server for Free on Linux
The tutorial shows you step-by-step and Visually How to Start RealVNC VNC Connect 6.x Server with a Free Subsbscription on GNU/Linux desktops – Step by step Tutorials.
RealVNC Connect 6.x Server is Free for a Home user account Subscription plan.

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Obtain a Free License to Run RealVNC Server on Linux
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Launch RealVNC Server as Service.
sudo vncserver-x11-systemd
Or:
sudo vncserver-x11-serviced
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And Authorize RealVNC Server Connections.
Click on Resolve:
Finally, Login with your RealVNC Credentials:
And
Authorize RealVNC Server Connections.
Click on Resolve: