What are easy ways to update Garmin GPS unit?

On a regular basis, millions of users are using Garmin GPS unit for tracking the unknown or rough routes easily. Users use GPS technology to find out the unidentified locations exactly. I am also using Garmin GPS device for finding out the rough routes exactly. It can be an issue of Garmin GPS update. By updating Garmin GPS unit, users can get the recent list of updated locations, roads and addresses. I don’t have the full knowledge about Garmin GPS update. I don’t have rich experience to update Garmin GPS unit properly. As per my skills, I am trying to update my Garmin GPS unit, but I am not getting the success to update Garmin GPS unit. So anyone can share the easy ways to update Garmin GPS unit in the correct ways.