For the basic begginer's answer, that doesnt really solve the problem, but can aleviate some of it... Face your camera at the darker part that you want to be well exposed, and half press your shutter. This should make it read a correct exposure for the thing you want to photograph. But will obviously over-expose any other part of the photo in brighter light. But often you can then crop around this... Just a simple tip, that might help
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