I have never had an internal hub gear bike before, so I don't know much about them.
My issue is that all of the gears stopped working suddenly when I was just riding the bike. The bike has 5 gears, everything was working fine, but one time when I was riding, the gears suddenly just broke. Now, when I change gears on the handlebar, nothing happens with the actual gears, it just stays in the same gear.
What could be the issue, and how to fix it?