이 차는
이 책은
the 은/는 still confuses me
does 이 차는 mean "Other than the other books this book...." and "other than the other cars this car....."

See a translation

I'm glad you asked. There're two elements to consider.

1) topic marker: -은/는

I guess you already know when to use -은 and -는. -은 is used when the preceding character ends with a final consonant (받침 or 종성): 이 책은

While -는 is used when the preceding character ends with vowel: 이 차는

2) subject marker: -이/가

Subject markers are also affixed to a subject of a sentence; however subject markers give focus to the subject itself while topic markers put more importance on description.

이 책이 내가 찾던 책이다.
This is THE (very) BOOK I was looking for.

내 책은 두꺼운데, 니 책은 얇구나.
My book IS THICK, but your book IS THIN.

Hopefully, my explanation helps.