In simplest terms. "Angle" is the same as "Field of View" ... in other words, how much to the left, right, top and bottom of the world in front of the camera is seen by the lens.
You can imagine an invisible cone, projecting from the lens out into the world, the point of that cone would be inside your camera. The base of the cone out in front of the camera.. extending outward the further it extends away from the camera.
Wider angle lenses mean that the image seen by the camera/lens is wider than narrower telephoto lenses. The angle is inversely proportional to the "length" of the lens.
A "long" lens, telephoto, has a much narrower view into the world than a wide lens. This is represented by the millimeter value of the lens.. so, a 14mm lens is wide, a 200mm lens is narrow. Essentially.
Things get a little more complex than that when you take into account sensor cropping and whatnot, but a 200mm lens will always give you a tighter angled view of the world than a 14mm lens. The difference for sensor cropping would be that those same lenses on a so-called "full-frame" sensor and a "cropped" sensor will show different images.
https://www.youtube.com/watch?v=eCa1dfl5o7k
Ideally you'll want primes (single focal length lens, not a zoom) that are "fast" ... meaning their aperture opens very wide.. the lower the f-stop number the faster the lens. So an f1.4 is faster than an f4. This means a few things; First, a faster lens requires less light for proper exposure. Secondly, a faster lens can produce a shallower depth of field (less in focus at any given time) -- but that depends on the aperture being open farther... an f1.4 lens stopped down to f4 isn't going to have shallower depth of field than a lens that will only open up to f4, until you open the fast lens up to a wider aperture/lower f-stop value.
Besides lenses, you'll also want to get some nice neutral density filters, which will let you decrease the amount of light hitting the sensor without having to close the lens aperture. This will allow you to get shallow depth of field in even very bright conditions.
https://www.youtube.com/watch?v=dGmpNslYuiY
The reason you primarily want primes is because they generally (not always, but the exceptions are usually quite spendy) have better optics and faster speeds than zooms. There's certainly nothing wrong with zoom lenses, and they do provide a great deal of flexibility, but for various reasons can be more difficult to work with... it can be more difficult to maintain focal length with a zoom lens while pulling focus for a shot, that's really the biggest issue. And, again primes tend to be faster.
The other reason to favor primes -- old nikon and canon (and compatible) manual prime lenses are readily available at pretty low cost at camera shops, thrift stores, garage sales, flea markets, and online (ebay, etc). Saving money is always a good thing
Note: Some of this is
my opinion, but it's based on fact..
Here's a few other people's opinions on good lenses to start your kit with:
https://www.youtube.com/watch?v=UekU93GzpI8
https://www.youtube.com/watch?v=paDcaG5CiME
https://www.youtube.com/watch?v=mQ_zhe78x-M