The best way to learn the unit circle is by starting with the basic angles in the first quadrant and noting their sine and cosine values. Learn the patterns of symmetry for these values across the four quadrants. Practice drawing the unit circle and labeling the angles in degrees and radians. Using mnemonic devices can help remember the order of angles and their corresponding (x,y) values. Repetition and regular revision of the unit circle will greatly improve your retention of the information.