To clip into an SPD pedal or a LOOK pedal (road bike pedal), hop on the bike and move the crank on the side where your lead foot/dominant foot is to the 2 o’clock position
Then, slide the foot forward until the cleat on the bike shoe engages with the clip on the pedal.
Finally, find the other pedal, clip in, and ride off.
To unclip, twist your heel outward, away from your bike.