Crown, thanks for moving and merging my post. I do not show my face, voice, or body on screen, so my setup is different.
You are correct it is filming my tablet. The tablet received data from my local website via the browser. I must note the website is a powerful studying website that I have developed for over a decade for studying. I never intended it to be use in youtubing. It turned out to also be the best text reader around and furthermore since it is also a studying software, I can invoke the other features when I need them.
I just made some videos: audiobooks, study questions, vocabulary words, etc. It's kinda like those instructional youtube videos. The audiobooks could cover different topics so I have two different audiobook channels: one educational and another for entertainment.
Also, they could be extended. If I want to double the output, I would just need another tablet, audio cable, and camera. The editing softwares, I use are free. Most of the time all I do is trim the beginning and end.