은/는 & 이/가's more (advanced) differences :    • 은/는 & 이/가 (Subject Marking Particles)...   (→the first 7 minutes of this link is about basic introduction & spelling, so you can skip those parts)

[time stamp]
00:01 intro
00:56 은/는 surface-level grammar
08:00 이/가 surface-level grammar
13:45 First Difference between 은/는 and 이/가
28:27 Second Difference between 은/는 and 이/가
45:16 Both 은/는 and 이/가 in a sentence
55:54 Quick Summary
57:51 my personal message to learners

You can find the class note here: https://explorekorean.com/review-note...
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Other Korean Lessons:

Korean Alphabets playlist
https://www.youtube.com/playlist?list...
Korean Grammar playlist
https://www.youtube.com/playlist?list...
Korean Vocabulary playlist
https://www.youtube.com/playlist?list...
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WEBSITE : https://explorekorean.com (a new website on the way, but we're using this temporarily for sharing class notes and quizzes!)
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Thanks for learning Korean with me!💗

Love,
Vicky