My favorite reference for media screen Concepts (Based on Mobile First).

mobile-first-media.css

/* @media Concepts (Based on Mobile First) */

/* Mobile First in General Concepts. */

/**
 * 16.1 Mobile Large 620px
 */

@media screen and (min-width: 38.75em) {}

/**
 * 16.2 Tablet Small 740px
 */

@media screen and (min-width: 46.25em) {}

/**
 * 16.3 Tablet Large 880px
 */

@media screen and (min-width: 55em) {}

/**
 * 16.4 Desktop Small 955px
 */

@media screen and (min-width: 59.6875em) {}

/**
 * 16.5 Desktop Medium 1100px
 */

@media screen and (min-width: 68.75em) {}

/**
 * 16.6 Desktop Large 1240px
 */

@media screen and (min-width: 77.5em) {}