Short answers, pulled from the story.
Kuat Drive Yards, later known as Kuat-Entralla Engineering, builds Star Destroyers in the Star Wars universe. They serve as the signature vessel of the fleet for the Galactic Republic, the Galactic Empire, the First Order, and the Sith Eternal.
The Imperial Star Destroyer Devastator, carrying Darth Vader, first appears in the opening scene of Star Wars in 1977, chasing the Corellian corvette Tantive IV above the planet Tatooine.
A 2016 estimate put the cost of an Imperial Star Destroyer at $636 billion, plus another $44.4 trillion in launch costs. A more recent estimate, based on the ship's stated weight of about 40 million tons, put the total above $100 trillion.
The Mega-class Star Dreadnought Supremacy, the flagship and capital of the First Order in Star Wars: The Last Jedi (2017), is described as 60 kilometers wide, larger than any Super Star Destroyer before it.
An A-wing piloted by Arvel Crynyd crashed into the Executor's command bridge, destroying its main navigation complex. The ship then lost control and was pulled into the second Death Star's gravity well, destroying both vessels.
Sith Star Destroyers, officially the Xyston-class, are built on the planet Exegol by automated factories dating back to the old Sith Wars and later modernized by Darth Sidious.