display: block;        /* Full width, starts new line - div, p, h1 */
display: inline;       /* Flows in text - span, a, strong */
display: inline-block; /* Inline but respects width/height */
display: none;         /* Hidden, takes no space */
display: flex;         /* Flexbox container */
display: grid;         /* Grid container */

position: static;      /* Default - normal flow */
position: relative;    /* Offset from normal position */
position: absolute;    /* Positioned relative to nearest positioned ancestor */
position: fixed;       /* Stays in place when scrolling (relative to viewport) */
position: sticky;      /* Normal until scroll threshold, then fixed */