In view of the upcoming Starfleet battle, here is an explanation of the level of the battleship. The level of the battleship refers to some of the more authoritative opinions from the Internet search, if you have any comments, you are welcome to spray!

S-Class Battleships: The most powerful interstellar warfare weapons, including super battlecruisers and giant space fortresses. These are basically strategic weapons, similar to the current nuclear bombs, and they are rarely used. Both the Super Battleship and the Giant Space Fortress have the power to wipe out the entire solar system, and high-level weapons such as the Super Black Hole Cannon are huge and powerful. Generally, S-class warships will form a battleship formation with several A-class and a dozen B-class warships to protect a star field or solar system.

Class A battleships: The main warplanes, including battleships, heavy cruisers, battlecruisers, aircraft carriers, etc. The main purpose of these warships is to fight for the supremacy of the universe, to fight against starfleets of the same civilization level, and to fight a high-level interstellar war in the galaxy. Because it is mainly used to compete for the right to control the universe, the battleship of this level does not consider fighting on the surface of the breakthrough planet at all, so the size of the battleship is super huge. It generally flies outside the orbit of the planet and does not land on the planet.

B-class warships: destroyers, star destroyers, etc. The main purpose of this class of warships is to fight interplanetary wars, such as pulling an interstellar fleet from Earth and flying to the Centaur system to fight aliens. It is mainly used for combat in planetary orbit, because it is to fly from the Earth to the Centaur galaxy first, and then fight with aliens, so the size of the battleship must be very large. Such warships can fly in the synchronous orbit of the planet and fight within the planet's gravitational field, but generally do not land on the planet, after all, it takes too much energy to take off. Huge energy weapons can attack enemies on the ground directly from synchronous orbits, making them the ultimate weapon on the planetary battlefield.

C-Tier Battleship: Frigate. The main purpose is to fight interstellar wars in the planetary system, for example, one day in the future, humans colonize the moon and Mars, and then the moon and Mars will become independent, and human beings will fight each other. Because it is mainly fighting within the planetary system, the frigate needs to consider breaking through the planet's atmosphere to fight, so the battleship hull cannot be too large and too heavy. This type of warship is the main force for air and space supremacy, which is important in Star Wars.

D-class warships: combat patrol boats, radar ships, minelayers, and communication ships are mainly used for internal operations in the planet's atmosphere and following the starfleet, as auxiliary ship support. The premise of the combat patrol boat is that humans have just escaped the shackles of gravity and finally built a spaceship capable of flying to Mars, but they have not yet reached the distance of colonizing aliens. At this time, although the space warships were able to break through the atmosphere and fight in space, they were mainly fighting on Earth. The battleships of the Gundam series are of this class, as is the stealthy space carrier in "The Avengers".

Because in the eyes of an interstellar overlord who has already dominated the galaxy, the Archangel in Gundam SEDD is nothing more than its combat patrol boat.

A C-class battleship, for a world with only a D-class civilization level, must use crowd tactics and use a large number of D-class warships as cannon fodder to fight.

E-Tier Battleships: Interstellar assault landing ships of the Star Overlord, small warships of low-level civilizations. That is, such a class as an ordinary armored transport ship. The firepower of the configuration is low-end, and the main role is to transport personnel and materials during the fleet's expedition or rest.

F-class battleships: heavy space fighters for interstellar overlords, cannon fodder battleships for low-level civilizations. Large Star Bombers and Large Fighters can also be turned into warships of this class. Further down there are basic air combat units, such as the four-wing fighter in Star Wars, or the kind on the cover of this book, and combat units like the Viking fighter or the Gundam Qì Man.