The Sony E PZ 18-105mm f/4 G is a versatile lens, you can see that in its name. From a focal range of 18mm through to 105mm you cover landscape, close, mid and medium distance. It’s no telephoto lens but 105mm goes far.
Constant aperture and the lens not extending when zoomed round this lens out. It stays the same length unlike the 18-135mm and keeps a constant aperture, perfect for video.
The only reason to take the 18-105mm of your camera would be to put on a close portrait type prime, wide-angle lens or a telephoto zoom.
Below is a comparison at 18mm, 31mm and 64mm on a landscape shot. Sure I could have gone in more than 64mm but I found that length ideal;
Here are more shots with the Sony 18-105mm on an a6500:
It is prices at $598 USD you can save a couple of hundred in getting it second-hand and really for most amateur and beginner photographers this lens may be all you need.