捡 vs 拣 (jiǎn): 捡 means to pick up something from the ground. 拣 means to select/choose from among things. In practice, they're sometimes used interchangeably, but 捡 is the standard for 'pick up.'
usage
捡到 = to find (by picking up). 捡垃圾 = to pick up trash. 捡便宜 = to get a bargain / to take advantage.