The melody of Big Girls Cry by Sia runs 262 notes across 104 bars, 2:42 long in Gm at 160 beats per minute. The tab sits low on the neck, mostly under the fourth fret, one note at a time — no chords to barre and no strumming pattern to keep up with. A piano backing track plays the chords and bass underneath, so the line you are learning sounds like the record even at half speed.
Prefer to strum and sing it instead? Big Girls Cry chords and lyrics.