For a general shot I use the "P" mode and let the camera expose for me using matrix meetering on normal scenes it does a pretty good job then I use the LCD screen to check the shot kind of like an instant feedback to see if its exposed, if not use some EV compensation. Or I will use "AV" or "TV" if I have to nail a certain aperture or shutter speed.
For the tricky shots I use Spot meetering and a version of the zone system I shoot JPG so I expose for the neutrals/average and check my highlights are not blowing out. Alot of RAW shooters will Expose to the right and make sure the shoot doesnt clip to capture the most dynamic range.
Its what ever suits your style best hope you get some ideas and devlop a good method that works for you
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