He was trying to explain about those syncromesh things. First off: look at
The article starts from a basic 2 speed transmission, moves on to an H-pattern 5-speed-plus-reverse, and then moves onto syncros.
Reverse, and sometimes first, generally doesn't have syncros, though the others almost always will. The trick the others mentioned, of letting the clutch in a bit (and possibly revving a bit) while in neutral is called 'double-clutching', and before the arrival of syncros, you had to do that at *every* gear change. The most common car I know of around here that has that property is the (old) Fiat 500.
Jasper
[1] That'd be here: