Here is a slick focusing technique I never thought of, but it works. It replaces the half-press and hold, then compose technique. It's much more intuitive in my brain than back button focusing. It uses "focus tracking" or something I like to call "sticky focus." You really should try this one.

In my youth, I thought the magic was to achieve a maximum black. It took me several years to learn that the magic is not in maximum black but rather in beautiful gray tones and chords of tones that please the eye. Increasing contrast and overprinting the blacks is rarely the answer. My apologies...