Clipless pedals are great. They are much more efficient, and allow you to spin at a higher rpm. The most important thing is safety, though! They keep your feet where they belong…on the pedals. Just push forward to click in, then twist sideways to disengage. Most good bicycle shops would be happy to set you up with some comfortable shoes that accept the cleats (included).
Note: The pricing for this upgrade accessory applies when added to new ELF purchases. Standalone purchase pricing may differ.