I gave you links and information in the post you made in the kitchen.

http://free-video-joiner.com/

I've used this to combine all my game cam videos rather than going through them one by one.

And these two programs are also freehttps://www.shotcut.org/download/

https://www.openshot.org/download/

and MaximumPC recommended this free program
https://download.cnet.com/VSDC-Free-Video-Editor/3000-13631_4-75764187.html