There are lots of looper pedals on the market offered by well-respected manufacturers, some being more complex and feature laden than others.
It's important to note that this course is not intended to be a product review, have bias towards any particular manufacturer, or serve as manual for any of these products. I only want to guide you through the typical functions and uses in global sense.
Simple loop pedals feature one multi-function footswitch and a volume rotary knob to adjust the volume of the loop playback. The footswitch on most devices functions as the record, overdub, playback, undo, redo, and stop control.
An LED indicator lights up red when in record mode, is green in playback mode, and will blink at the beginning of your loop to help you keep track of it. Learning how to use these features may take a bit of getting used to as you'll be playing and operating the switch in real-time while playing the guitar.
More involved pedal designs include built in rhythm grooves, user preset storage of your favorite loops, stereo in/outs, and multiple pedal switches. Popular loop pedals include the Boss RC-3, TC Electronics "Ditto," Digitech "Jam Man," etc. Selecting the type of pedal to use will be a personal preference depending on the complexity of your sonic needs and the type of functions you require. I chose to use the incredibly simple and highly respected Boss RC-3 Stereo Loop pedal with drum grooves and a pre-roll function. It also records up to 3 hours of high quality audio and has memory locations to store your favorite loops. You can also load in .wav files to the memory locations and store your presets via USB connectivity.