Portrait lenses, anyone?
“The closer you are, the bigger the nose will be”. So a wide angle lens, which needs you to be close, gives you distorted portraits. On the other hand, an infinitely long lens (say, a 1,000,000mm lens) will give you zero distortion.
Time for examples.
Can you see that the wider 20mm lens, which needs you to be closer to the subject, distorts that subject more? While a longer 100mm lens makes the image look more neutral. In fact, the longer the lens, the less the distortion.
My favourite headshot lens is my 70-200mm f/2.8 lens. For half/full body fashion shoots, it is the 85mm f/1.2 lens.
Fur full body only shoots? 50mm, maybe.
Anything environmental? Wider. Maybe 35, 24, or even 16 or even 10mm. Enjoy!