You should use video thumbnails on all your videos. It is more professional looking and also helps viewers recognize your content immediately.
Your thumbnail should always include a personal picture of you and title to the video.
Your thumbnail should also contain graphics appropriate to the video content.
You can create thumbnails using canva as well as other tools.
Personally, I use a very affordable one-time fee tool (it has built in easy to follow step by step training tutorials– I needed that) You can check it out here: