I have never used the SLR of Nikon D7000 once. I want to ask, for example, which gear should I start learning first?

In fact, M file is not as magical as many people say. In fact, all parameters can be adjusted manually. No matter what files are used, the photos taken when the parameters are consistent are exactly the same. Many automatic gears, like semi-automatic gears, can adjust the parameters under M gear.

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The factors that determine exposure are aperture, shutter speed and iso, which together determine the correct exposure. Therefore, I suggest you read the basic books of photography first, or check the information online. As long as you understand how these three parameters interact, you will get started.

Then read the instructions carefully and read them several times to master some basic operations of the camera, especially how to adjust some parameters.

Next, you can shoot with the aperture priority file, that is, the A file. This is a semi-automatic gear. You can manually adjust the aperture value, and the camera will decide the shutter speed according to the exposure. You can also use exposure compensation to make fine adjustments according to the shooting results.

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After you fully understand the aperture, shutter, iso, white balance, color temperature and exposure compensation, you can try M file again.

Pay attention to the exposure indication in the viewfinder when you are in M gear, which can be used as a reference.