It seems that every single one of these treehouse "teachers" have too much spit in their mouth when they talk. I think that it gives them comfort. I know that it gives me discomfort.
Can't tell if you're serious or not.
The best way to get around is to make sure you watch the video and do what "teachers" are teaching and do it in workspace, then you might want to rewatch the video to see if you didn't understand that caused an error in your code.
It is hard when one doesn't pay attention as I can give my example. Rewatching helps me to understand and more cement it when I write the same code.
(BTW it is not right words to use "teacher has too much spit in their mouth when they talk. I think that it gives them comfort." as it shows the level of respect.)