How to take pictures of blue sky and white clouds, green mountains and green waters?

There are usually three ways to make the sky blue:

1. Post-processing, such as PS. This is not much to say.

2. If you use a SLR, add a polarizer.

3. Use spot metering.

According to your situation, you can only use the third method to exclude 1 and 2.

I suggest you use the "aperture priority" mode, that is, the A file. If shooting scenery, the aperture can be set above F5.6, and F8 is recommended.

Read your manual again and find the function of "spot metering". Switch to "spot metering" mode, aim the central area of your camera at the blue sky, lock the exposure value by half pressing the shutter, then move the camera, set the composition you want, and press the shutter to the end to finish shooting.

So you can basically shoot sky blue. But the ground part may be underexposed and dark.

These words involve some photographic terms, and I wonder if you can understand them.

You can weigh it yourself and make a choice, whether it is post-processing or spot metering.