10:00Don't make this common mistake – Use the S!
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Most English learners know the S trips them up but aren't sure of the rule. 'Common mistake' says they're probably getting it wrong. The huge red S shows it's one letter, and 'When to' promises the rule you can check yourself against.
'Common' tells problem-aware learners they're probably making this mistake themselves, and 'Don't' makes it a warning from the teacher rather than a neutral grammar lesson.
One giant red letter in quote marks reads instantly at feed size, and Ronnie's raised hands and open mouth make it look like a lively lesson, not a dry textbook.
When your lesson fixes an error tied to one tiny thing, a letter, a word or a button, make that one thing huge in the thumbnail. Let the title say it's a common mistake, so viewers suspect it's theirs.
Make the tiny thing huge, and tell them it's a common mistake.
Apply this pattern to your next video.
Bring the reference into a packaging brief, then decide what your title and thumbnail should each communicate.