I will preface this with I have never had an art lesson nor a photography lesson in my past 70 years.
I purchased a digital camera and several lens about 5 years before retirement and began the photography era. I began to experiment with digital images in a totally new direction.
I started out enhancing 'keeper' images and then discovered that 'throw away images' could be enhanced by layering the images using textures, masking, and blending .etc. Sometimes 2 images work and sometimes I might have as many as 6 or more stacked. There is a lot of trial and error until I am satisfied with the uniqueness of the image.