Originally posted by Gregor I like shooting the outdoors: animals, landscapes, sports, and the like.
And I like beer, pretzels, cigars, and the like. Nice things to like, but they're rather different. And there are many different sorts of animals, landscapes, and sports. And all have different optical requirements -- or maybe not requirements, but various approaches and lenses 'work' well.
Landscapes: Many people think of ultrawides for landscapes, but except for long tele shots of distant trees and mountains, most landscape pics you'll see published were shot in focal lengths equivalent to your kit lens. Ultrawides push the horizon away, and are best for emphasizing a close subject. I crawl on the ground with a fisheye for miniature landscapes of weeds and rocks.
Animals: Wild, captive, otherwise? Fast- or slow-moving? Out in the sun, hiding in bogs and under rocks, coming at you with deadly intent, or what? Birders often prefer long, fast zooms; a shorter, not-so-fast zoom will work in a zoo or farmyard; use a macro for ant farms; an ultrawide zoom is best if you're surrounded by coatimundis or hungry pigeons.
Sports: Similar to animals (not to insult athletes!) -- track & field or soccer, chess, baseball, poker tournaments or arm-wrestling, indoor vs outdoor basketball, bowling, ping-pong, all will call for rather different approaches. A long fast lens for far fast stuff; a kit lens for most outdoor non-distant stuff; a shorter fast lens for close indoor stuff.
Your lens choices are dictated by distance, light, how fast the subject moves, and how much you want to spend. If you don't want to spend a lot, read all the threads here about getting fast, sharp, CHEAP manual primes etc. And read up on how pictures you like are made.