To achieve a good stitch, we need images with an overlapping area that are the same or similar.
Photos need to have a reasonably healthy overlap. In general you need an overlap of a quarter or more between the two images.

Images need to be taken from the same general location with the same magnification (zoom).
Close foreground taken with a normal camera is more difficult to match.

The overlapping areas of two photos wont be the same due to Parallax.
The aspect of objects in the foreground move (similar to putting a finger in front of your eyes:- looking with one eye and then the other). You also get different reflections from foreground objects when you change your view direction.

Movement may also make it difficult to match areas. For example with wind you have cloud movements and branch movements.

Camera lenses warp landscapes or objects on a photo as the rays get distorted by the camera lens and a capturing surface. Imagine you are using a magnifying glass and swinging it over objects. Cameras warp images up to a few percent over the length of a photo as it uses a lens and a capturing surface. The warping is worst on the sides and wide angle cameras tend to distort the landscape even more. We need a healthy overlap to identify enough matches to minimise warping.

When you take photos, you would normally take the photos in the horisontal or vertical whilst keeping your camera level. Try to take the photos more or less on the same level by not rotating the camera too much between photos.
You also need photos with some shapes in them (you need contrasts or edges)

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