Doing something handily means it's easy or convenient. If the post office is handily located near your house, you can handily mail all your holiday cards on your way to school.
This adverb can be used for things that are close at hand, making them easily available, or for anything done gracefully or dexterously: "She handily shuffled the cards and dealt." However, you'll most often find handily filling in for "easily," in sentences like "They handily won the game," or "He handily beat his opponents in the election." The earliest meaning of handily, dating from the 14th century, was "done by hand."