Both great comments... I realize this is a huge topic. For me personally.. I am trying to answer the question... what makes a great wildlife photo. I can take great portraits of birds... but doing that does not excite me. But coming up with the story that attacks the eye is truly what I am trying to master. So the answer to my question is what thought process photographers use to approach the scene or subject. But again... great comments. TKS
I usually start with something pretty simple - Where is the light and what kind of image can I hope to make? The light provides a constraint around the kinds of images that are available, the shutter speed and aperture I use, and the kind of equipment that is needed.
Next for me is making decisions about the subject and composition. Even in perfect light, do I really want to fool with another photo of a Northern Mockingbird even if it does have a nice bug in it's mouth, good lighting, good background, etc. On the other hand, I might make an image just for the point of testing or illustrating a point for an upcoming article or class. I'll avoid typical shots that have a low probability of being a successful artistic image. I'll seek out images that are less common or have some outstanding component. It's okay to make images that have a low probability because they are hard to capture because success may produce something exceptional.
For example, on a recent trip to photograph shorebirds, the wind was from the "wrong" direction and the birds were facing away from me. Rather than photographing a bunch of bird butts, I worked on backlit subjects - both in flight and resting. It's more challenging, and has a low keeper rate, but a bunch of birds facing away are almost all discards anyway. I want something that makes the image special.
Often a good wildlife photo is not based just on the subject but also the background. So after looking at the light, I also look at how I can make the background work in my favor. A clean out of focus background, a dark shadow in the right position, or an environmental context are all choices available to compose my background and context.
For landscapes, it starts with light, but continues with where the eye needs to go. I need a subject or destination that is the prime feature of a landscape, then I need appropriate foreground, midground and background elements to make it interesting. Often a landscape works with an exaggerated foreground element so a wide lens is used to increase emphasis on that subject or element. But I might use a long lens like a 70-200 to pick a portion of the landscape that has nice layers of light, shadow or fog.
It's a journey. Look at other really good images - not social media but look at contest results for an idea of what works. Post in the critique forum here.
One final thought. You can't always make the image you visualize. So you may have to go back repeatedly to incorporate what you learn. That's why photographing close to where you live is so useful. But also don't get stuck in the rut that what you visualized is the best photo that can be made. Learn to listen, see, and find what great photos are available with the material at your disposal.