Brandy

Brandy, simply put, is a distilled wine. It is categorised under Distilled Alcoholic Beverages along with Whiskey, Rum, Gin, Vodka and Tequila, but it's in a way a cross connection between Fermented liquor and distilled liquor. A Brandy typically containts 35% to 60% Alcohol by Volume ( 70-120 US proof ) and is usually consumed as an after dinner digestif.

Although Brandy is generally classified as a liquor produced by distilling wine, in a broader sense, this encompasses liquors obtained from the distillation of either pomace ( the soild remains of grapes after mashing and extraction of juice for wine making ) or fruit mash or wine.

It may be noted that Brandy like Gin is also one of the original Water of Life or eau de vie, carried over from the medieval tradition of an aquaous solution of ethanol used as a medicine.

The history of Brandy is closely tied to the development of commercial distillation in and around the 15th Century. In early 15th Century French Brandy made way for a new cross-Atlantic trade or Triangle Trade and replaced Portuguese Fortified Wine or Port from the central role it played in trade, mostly due to the higher alcohol content of the Brandy and ease of transport. However by the late 17th Century, Rum replaced Brandy as the exchange alcohol of choice in the Triangle Trade. More info on Wikipedia for the interested Brandy aficionados. Note that an Apricot Brandy can refer to the liquor (or Eau de Vie, Water of Life) distilled from fermented apricot juice or a liqueur made from apricot flesh and kernels.

Curacao

Curaçao is a liqueur flavored with the dried peel of the bitter orange laraha. It's been a popular liqueur for more than 150 years, the Dutch East India Company created this orange liqueurs by steeping orange peels in alcohol from the island of Curaçao and called it Curaçao liquor, unlike Triple Sec, Curacao has added spices and herbs to the orange and Curaçao comes in a variety of colours such as clear, orange or blue.

Blue Curaçao being the most used of them, in cocktails. Although Curacao is an orange tinted liquor, Blue Curacao is a regular Curacao dyed bright blue to give it a striking appearance, and thus is a very popular cocktail mixer, whenever a striking colour is desired.

Blue Curacao is usually around 25% ABV.

Blue Curacao is essentially Orange Liqueur tinted Blue, the colour doesn't influence the taste and thus Orange Curacao is interchangeable with Blue Curacao in recipes, if the colour is not important in the appearance.

NOTE: Blue Curacao being an Orange Flavoured Blue Liqueur, it's primary purpose in a cocktail is introducing the Orange flavour and the striking sky blue to the drink, so, if a bottle of Blue Curacao liqueur is something you are not planning to buy right now, you can manage with the Blue Curacao Syrup.
It would add the same flavour and colour profile to the cocktail, all we need to do is simply count for the alcohol absent in the syrup and account for it.

Pineapple Juice

Rich in antioxidants, this juice pressed from the pulp of the Pineapple is a good protection against cell degeneration, It contains bromelain, a group of enzymes known to reduce inflammation, improve digestion and boost immunity. In drink mixing, there is nothing like the tropical flavour of pineapple juice to add that tropical freshness and nuance to a cocktail.

In drink mixing pineapple having a fruity tropical aroma pineapple juice is a good companion for tropical fruits such as mango, banana, passion fruit, and also pairs well with oranges and grapefruit juice.

Pineapple juice is the juice pressed out of the pulp of the pineapple fruit, several varieties of pineapple are used to manufacture commercial pineapple juice. High on Vitamin C and enzymes that have been shown to activate healthy immune response, it’s a good juice to start a day. The enzyme bromelain in pineapple juice, triggers analgesic response in the body to fight pain and reduce swelling. In cocktails, Pineapple juice goes best with Vodka and is often a regular juice in many Vodka cocktails.

Bitters

Alcoholic spirits infused with botanicals such as herbs, roots, fruits and leaves, are called Bitters.
Bitters consist of water and alcohol which has been steeped with various herbs, fruits, leaves etc. Bitters are not to be drank neat or even as the base spirit of a cocktail, these are usually concentrated alcoholic concoctions and just a dash or a few drops are all we need to add that taste to a cocktail.
There are exceptions and some bitters like the Italian Amari is consumed without mixing in a cocktail. It has a bitter sweet taste and alcohol content is somewhere between 16%-40%. Generally in Europe its being consumed as an after dinner digestif.