When applying a picture texture to an object it comes out as kind of cut in half diagonally and distorted, is there a fix for this?
Blender doesn't know how to apply the image to the object, so it does all that stuff because it doesn't know what else to do. You need to tell it how to apply the image by making a UV map. The default cube in Blender comes with it's own UV map so you can follow these steps:
1) With the default cube selected open up the UV tab in the top bar
3) The UV map will be exported as a PNG. Edit it in whatever photo editing, drawing program you want to use. (eg. Photoshop, Illustrator, Firealpaca) In your case you would take your tree image and place it in the same spot that I put my blob.
Hope this helps! IDK if I explained this very well. If you have any questions pls ask. Blender has a steep learning curve but once you do learn it it's great. :D