I use videos from Rockin' English that correspond to what we are doing in class. I think these are helpful for the students. Rockin' English Lessons - YouTube
I have found a few Youtube channels that have more than one helpful video. So, I figured this thread could be where we post one video but recommend that others look at more on the channels.
This channel has good examples of idioms and easy-to-understand explanations of them: https://www.youtube.com/watch?v=xLSpInYhzYw&list=PLItVCkPXPy9Yie_JOKkzflnpXZcjdQPqx&index=2
This channel goes over the differences in the pronunciation of IPA (International Phonetic Alphabet). I recommend this for higher-level classes. Some students may be familiar with IPA, while others may not be. So, a quick explanation or survey of familiarity might be needed. If no students, or the majority of students, are not familiar with IPA, it might not be a good idea to use these, because it might be too confusing. It's up to you to decide, of course. https://www.youtube.com/watch?v=qDego-Mt1W0&list=PLItVCkPXPy9Yie_JOKkzflnpXZcjdQPqx&index=13&t=54s
The Passive Voice,https://www.youtube.com/watch?v=7FBr-G0ur9I
I recommend this for higher levels. It has examples of passive voice, but it also has vocabulary with clarifications you can go over. For example, it mentions rush-hour and gives a definition of it. So, if you want to add an extra layer of teaching, you can go over the vocabulary and definitions as well.