Finding the right lens is important and it all depends on the job and specific setups. The list below might help you in buying the right lens without necessarily spending a lot.
Day long or travel lens
If you are traveling or are on holidays, it might not be convenient to carry heavy gear such as cameras and different types of lenses. The ideal lens when you are traveling should be convenient to carry around and versatile enough to give you the possibility to shoot portraits, landscapes and provides a good zooming. An example of a good all-day lens would be the Panasonic Lumix G Vario 14-140 mm f/3.5-5.6.
Photographing fast subjects such as vehicles, kids and pets
If you want to photograph children or pets in action you might find that your kit lens is unable to keep up with the movement when it comes to aperture and focal range. To photograph such rapidly moving subjects or even for sports photography, you would be needing a lens that offers a large maximum aperture and better focal length reach. A recommended lens for this purpose could be the EF-S 55-250 mm.
Almost all lenses are suitable to street photography. But generally, a range of focus of 35 to 50 mm could be considered ideal for urban areas. You might want to keep your lenses discrete to capture natural shots without the subjects being distracted by the camera. A lens with a fast maximum aperture might also be great if the lighting is not so good. A good street photography lens could be the Fuji XF 23 mm f1.4 R Lens.