Fun fact: Editors are usually also people. Except for that one dog I met during a cold winter's day in 1987 in a run-down London pub.

Or read magazines and newspapers from reputable publications. My grammar and writing have improved tremendously from reading quality magazine articles, e.g. stuff from The Atlantic or The NY Book Review or whatever.

Both magazines and books are valid forms of information consumption and books are not the only way to improve your writing, reading, and understanding of the world.