Why is green associated with starboard?
Ships of the City of Dublin Steamship Company were equipped with white masthead, green starboard lights and red port navigation lights. The P&O Company of Southampton had a different arrangement; green for port, green and red for starboard. The British Admiralty ordained that starboard was to be green and port red.
Since port and starboard never change, they are unambiguous references that are independent of a mariner's orientation, and, thus, mariners use these nautical terms instead of left and right to avoid confusion.
The red port side, on the other hand, indicates zero or limited visibility, so it's often called the blindside. In this case, other boats or ships should turn to the right-hand side. They will stop to avoid colliding with you when they're facing the port side.
If a vessel is crossing your path, the colour of its sidelight shows you which direction it's travelling: red sidelight – crossing your path from your starboard (right) side to your port (left) side. green sidelight – crossing your path from your port (left) side to your starboard (right) side.
Green colour is generally assumed to be highly unlucky. The origins of this superstition are different but the most reliable ones are two. The first refers to the green colour of mould which could corrode the woods of ancient sailing ships, hence extremely likely to cause their dissolution and consequent sink.
When standing on the deck of a yacht, facing the bow as we mentioned before, the port side will be to your left and the starboard side will be to your right. If you turn around to face the stern of the boat, or the back, now the starboard side will be on your left, and the port side will be on your right.
Sailing ships steered on this principle. The command "hard a-starboard" meant the wheel had to be turned to the left and not, as the instruction would suggest, to the right. Steamships, on the other hand, steered like cars. You moved the wheel to the right and the ship took the same direction.
The left side is called 'port' because ships with steerboards or star boards would dock at ports on the opposite side of the steerboard or star. As the right side was the steerboard side or star board side, the left side was the port side.
The front of a boat is called the bow, while the rear of a boat is called the stern. When looking towards the bow, the left-hand side of the boat is the port side. And starboard is the corresponding word for the right side of a boat.
Shipbuilders of the early years of shipping would use a copper coating as a biocide, to prevent organotins from sticking on the vessel's hull. That copper coating was responsible for the ship's red color.
Why ship Bottom is red?
Copper oxide has a reddish tinge, thus giving the paint it's much famous red colour. That is why ships are painted red below the hull. Tri-Butyl Tin(TBT) had been mainly used as a primary toxin against the growth of marine organisms on the ship's hull even a few years back.
The purposes of mooring buoy installation are first, to avoid ships releasing anchors to seafloor so the marine ecosystem is maintained, and second, to assist ships to dock at safe distance in order to reduce the possibility of ships hitting the seafloor.

One short blast tells other boaters, “I intend to pass you on my port (left side)." Two short blasts tell other boaters, “I intend to pass you on my starboard (right) side." Three short blasts tell other boaters, “I am backing up."
help prevent pollution in case of liquid cargo (like oil in tankers)
Red light, night light. The human eye is less sensitive to longer wavelengths, so red light is chosen to preserve the night vision of the crew while still allowing them to still see their instrument panels.
The name may not be identical, actually or phonetically, to any word or words used to solicit assistance at sea; may not contain or be phonetically identical to obscene, indecent, or profane language, or to racial or ethnic epithets.
At sea, the use of the word “Rabbit” is prohibited and having such animal on board is prohibited. Just saying the name could be a bad omen. Sailors call him “the big-eared animal”. The origin of the superstition is believed to have come from a shipwreck.
This practice comes from an ancient Irish and Scottish tradition that forbade women from wearing any green on her big day, explaining that the color was dangerous and associated with fairies who would destroy the person wearing green if they were discovered.
Titanic carried a permanent, but slight, list to port on her maiden voyage, caused by the loading of the ship. However, immediately after the collision, which was on her starboard side, she listed to starboard, as the initial water rushed in.
"Head" in a nautical sense referring to the bow or fore part of a ship dates to 1485. The ship's toilet was typically placed at the head of the ship near the base of the bowsprit, where splashing water served to naturally clean the toilet area.
Can starboard be screwed together?
King StarBoard is easy to assemble using standard woodworking tools. You should use mechanical fasteners (screws, bolts, or threaded inserts) to secure it together.
According to a claim made in 2010 by Louise Patten (the granddaughter of the most senior Titanic officer to survive, Charles Lightoller), one of the ship's crewmembers panicked after hearing the order to turn “hard-a-starboard” in order to avoid the approaching iceberg.
This was a standard manoeuvre called 'porting about'. In 1912, helm orders were still based on the old sailing-ship tiller movements, so hard-a-starboard meant 'put the tiller to starboard (right)', thus turning the rudder, and therefore the ship, to port (left).
Titanic struck a North Atlantic iceberg at 11:40 PM in the evening of 14 April 1912 at a speed of 20.5 knots (23.6 MPH). The berg scraped along the starboard or right side of the hull below the waterline, slicing open the hull between five of the adjacent watertight compartments.
Red/Green/Bicolor
Red lights are located portside, and green are starboard. The lights shine from dead ahead to 112.5º aft on either side of the vessel.
To set forth these navigational rules, the terms starboard and port are essential, and to aid in in situ decision-making, the two sides of each vessel are marked, dusk to dawn, by navigation lights, the vessel's starboard side by green and its port side by red.
The green light indicates a vessel's starboard (right) side.
Directions in Navigation and Steering. Along with the port and starboard nautical terms, colours are also used to aid in navigation especially during night manoeuvres. Red is the international convention for the port side, while green is the colour for the starboard side.
The word 'starboard' is the combination of two old words: stéor (meaning 'steer') and bord (meaning 'the side of a boat'). The left side is called 'port' because ships with steerboards or star boards would dock at ports on the opposite side of the steerboard or star.
All-Round White Light: On power-driven vessels less than 39.4 feet in length, this light may be used to combine a masthead light and sternlight into a single white light that can be seen by other vessels from any direction. This light serves as an anchor light when sidelights are extinguished.