billiards Players
The word billiards, though plural in form, is singular in meaning. There is no such thing as a billiard. You can refer to a billiard ball or a billiard table, but in those constructions the word billiard is an adjective, not a noun.
yes
By watching the most skilled players and practising.
Billiards.
Professional billiards players generally do not get a salary. However, they can earn up to $30,000 a year even as beginning professinals.
The noun 'billiards' is a mass (uncountable) noun, a type of aggregate noun; a word representing an indefinite number of elements or parts (like news or clothes). The noun 'billiards' is a word for a type of game (singular) takes a verb for singular. The word 'billiard' is an adjective and a noun. The noun 'billiard' is a word for a type of shot in cue sports, not the singular for the type of game.
Billiards.
yes
Eddie Robin has written: 'Winning One-Pocket...As Taught by the Game's Greatest Players' 'Position play in three cushion billiards' -- subject(s): Billiards
i hate cheese
This is typically a billiards term meaning, "a shot in billiards in which the cue ball strikes each of two object ball".
There are no points for pocketing a particular color ball in billiards. However, snooker awards 1 point for potting (the term used for pocketing by snooker players) a red ball.