The melody of Good For You by Selena Gomez runs 293 notes across 49 bars, 3:08 long in Bbm at 88 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? Good For You chords and lyrics.