quick rundown on basic photography stuff so you know what people are saying when they recommend you a system
lens speed: how much light enters the lens overall, measured on a relative scale called “stops” denoted in F/ or T/ (T is usually more common in cinematography, and denotes the amount of light getting to the sensor rather than the light entering the lens.) T stops are more generally more precise a benchmark. Lower stops mean the lens gathers more light and can shoot in darker environments or at shorter exposures.
Focal length: The distance at which the lens converges light, indirectly affects field of view and percieved distance from the camera. Measured in mm, shorter focal lengths are “wider” because they tend to have a larger angle of view
Prime: a lens without a zoom, fixed focal length
Crop Factor: very important to choosing the right focal length lenses. All focal lengths for standard format cameras are measured under the assumption that your sensor is “full frame” but many systems use smaller sensors. You multiply the crop factor by the focal length to get a rough equivalent focal length for your system. For example, my BMPCC only has a 16mm sensor, with a little more than a third of the area of a full frame sensor, therefore all my lenses’ equivalent focal lengths on that system will be 3x what the lens actually says.
Generally, landscape photography favors wide, sharp lenses over fast ones because you can always just expose longer for a better picture (your subject isn’t moving) and wildlife photography favors fast, long lenses so you can get animals in motion without underexposing or blurring the image.
You can do landscape photography on pretty much any system with a modern sensor, but wildlife photography is a lot harder without good stabilization and features like burst mode