When filming and editing videos, there are a few important details that you should know beforehand record when pressing the button and saving the assembled video file.
Height to width ratio 16:9
Your grandmother's TV screen had a height-to-width ratio of 4:3, your new TV will most likely have a "wider screen" or 16:9 ratio. In the early years, YouTube also only had a 4:3 screen ratio, as a result, all older videos are "bordered" in black in the new YouTube video window.
4:3 video
The wide screen is easier on the eyes, and it's easy to set up in your camera before you start recording video - you just have to find a place in the menu where it says 4:3 or 16:9.
16:9 (widescreen) video
Video file: mpeg4, Full HD (720p or 1080p)
Although YouTube shows everyone a screen with a height of 360 pixels (marked below the video window) as a standard solution, and only a few bother to choose the Full HD (720p or 1080p) version instead of 360, this is no longer a topic of the future, but of the present, because who wants a video on full screen to watch, already chooses a higher resolution today.
Therefore, it is worth uploading the original file (currently up to 2GB in size) to YouTube, even though it may take significantly longer to load (in case of a poor internet connection, leave the loading overnight). Be sure not to make a lower quality video for the web - YouTube HD full screen image is already better than your grandmother's green TV image today. Probably in a year or two the HD format will become everyday, so why not use the higher quality today.
YouTube supports various video file formats, but it is recommended to upload the file in the original version and in mpeg4 format. YouTube itself converts it to a .flv format file that is actually displayed on the screen, but the video quality is maximized by doing so.
If it's not difficult for you to remember h264 video codec and MP3 audio, then use them in the recording process of the video file.
If you don't produce the video yourself, a'la agency produces a TV commercial for you, then don't forget to ask the agency for the original file.
***
Finally, the Big Round Question: which camera and/or editing program do you use to make your videos and how satisfied are you? You can leave your opinions or questions here in the comments...