Want to learn how to create a custom title bar in electron? Well, it's pretty easy. I would recommend skipping to 2:00 as that's where the actual tutorial starts.
If you would like to learn more about custom window or electron itself please leave a commend with any questions and I will gladly make a video on that subject. Also, the official docs for electron are very well made and a great place to start making electron apps.
https://www.electronjs.org/docs/api
Enjoy :)