I think it's probably too early for you to be thinking about a specialist landscape lens or fast prime at this point. You might actually be better served to find a used 18-55 kit lens, while you learn your way around the camera and glass and landscape technique, and which focal lengths do what.
With landscape shooting, night-time and low-light photography typically requires a sturdy tripod, rather than a fast lens with a larger maximum aperture.
And if you want a wider vista in the viewfinder, then a 24mm lens is still not particularly wide, yielding only a 35mm-equivalency on 1.6x crop. 24mm is really only wide on a full frame camera. The EF-S 24mm f/2.8 STM pancake lens is a good purchase and good quality, but is more of a general-purpose, walkaround, street-shooting lens, rather than a dedicated landscape lens.
The low-cost (~$300) beginner's ultrawide-on-a-crop is probably the EF-S 10-18. The general-purpose walkaround zoom that goes wide on a crop is the EF-S 15-85. The fast wide zoom for crop is the EF-S 17-55/2.8. Both both of these lenses are in the $800 price range. And an 18-135 (as you know) gives you a much larger zoom range to work with, and costs less than either. So, you need to really know what your priorities and budget are going into lens shopping. Limiting yourself to only the $250 and under fast primes in Canon's lineup may not be getting you what you really want, here.
See also: Lens upgrade paths (sub $1000) for the EF-S 18-55mm IS kit lens for Canon APS-C cameras
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