That is up to you to decide, you may want to compare the two actress who played them in the films.
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Harry kisses Cho Chang and Ginny Weasly.
In the book he kisses Ginny in her room before being walked in on by Ron and Hermione. In the film he kisses Ginny in the Burrow kitchen before noticing that Fred is watching them :)
Yes, he kissed Cho Chang in the 5th book, and Ginny several times in the 6th and 7th books.
Yes, Cho Chang did try and take Harry to the Ravenclaw common room to look for the Lost Diadem in Harry Potter and the Deathly Hallows however Ginny was unhappy about this and suggested that Luna Lovegood took him.
First Harry kissed, Cho Chang. And then later on kissed Ginny Weasley. Later Ron and Hermione kiss. But I believe that is all of them.