Photography for geeks
If anyone wants to move beyond using the "auto" setting on their camera (or phone), I would recommend the book Understanding Exposure by Bryan Peterson, the first edition of which was published in 1990:* https://www.goodreads.com/book/show/142239.Understanding_Exp...The principles involved haven't changed much in the intervening decades; the current fourth edition was publish in 2016.If all you have is a phone you don't have to get new equipment: just perhaps a third-party 'camera app' that allows you manual control of aperture, shutter speed, ISO/sensitivity.Once you know how each of these settings alter the resulting photo you can use them to alter the composition of photos, which is a whole other craft.Edit: seems recent smartphones have little-to-no adjustable camera settings.