That sharp dip at 1715 is a carbonyl, C double bond O, shouting its name.
Every bond vibrates like a spring. It absorbs infrared light only at its own frequency.
So read left of 1500. Broad O–H near 3300, sharp C–H just under 3000.
Right of 1500 is the fingerprint region, a crowded tangle unique to each molecule.
Find peaks, match bonds: broad O–H plus C=O at 1710 means a carboxylic acid.