Medium-wide to short-telephoto zoom lens. In full-frame parlance, this would be a 35mm to 135mm zoom. Wide-angles in the medium range (28mm or 35mm) are easy to learn to shoot, and do not require near as much discipline and composing skills as do wider-angle lenses. Medium telephoto (up to about 135mm or 150mm, in Full-Frame type angles of view) setting are fairly easy to work with.
In today's camera market, for APS-C sensor sized cameras, the standard beginning lens is the 18-55mm or "kit zoom". Multiply 18mm x 1.5 or by 1.6 and you get roughly a 28mm lens, with the top end of the zoom's 55mm setting delivering an old-school full-frame (AKA 135mm film format, 24x36mm negative size, 4x6 inch print ratio) equivalent of about an 88mm lens, or a short telephoto.
"Medium" telephoto would be 105mm to 135mm, perhaps 150mm or 180mm at the top end.
I think that while learning, the medium-wide-angle to medium-telephoto focal lengths are the easiest,. and the most-productive, for beginning to get your feet wet.