So I’m trying to learn how to read music by myself, I have a treble cleff with 2 flats so I’m in Bb chord with Eb and Bb but aside from that there are other notations like Gm7 and Bb/F and Eb sus2. I’ve printed my circle of fifths and it makes sense but what does the other things mean. What does this mean, cuz when I play the song there’s a note that sounds wrong to me. The song is A Thousand Years

Thank you,

So I’m trying to learn how to read music by myself, I have a treble clef with 2 flats so I’m in Bb chord with Eb and Bb but aside from that there are other notations like Gm7 and Bb/F and Eb sus2. I’ve printed my circle of fifths and it makes sense but what does the other things mean? What does this mean, because when I play the song there’s a note that sounds wrong to me. The song is "A Thousand Years"

Thank you,