there are two possible answers to this question that seem plausible to me.
1) A Renaissance man: named after the era famed for creativity and development in a wide variety of areas
2) A Jack of all trades, master of none: derived from the status one would achieve in their chosen trade; a master would be part of a guild for a certain trade while his 'jack' would be his apprentice or assistant in training.
The person who buses tables in a restaurant is often called a bus boy/girl. Other names for this position are server or waiter/waitress.
Often called a wire, except international telegrams are often called cables.
A person who hopes for something can be referred to as an "optimist" or simply a "hopeful person." This individual often maintains a positive outlook and believes in the possibility of favorable outcomes. Depending on the context, terms like "dreamer" or "believer" may also apply.
A person who aquires art for a gallery, museum or private company is called a curator. But these people are not art collectors in the same sense as an ordinary person who buys a lot of art is termed an art collector. A person who gives financial assistance to an artist is called a benefactor, but again, though benefactors are often collectors the two terms are not synonymous.
A very small kitchen is often called a kitchenette.
Polymath
I've heard them called a "renaissance man/woman" If they are older, and have lots of practical knowledge in a field, sometimes they are referred to as a "geezer tech."
A person who is knowledgeable is often referred to as an expert, scholar, or well-informed individual in a particular field or topic.
A person who learns a lot is often referred to as a scholar, a knowledgeable individual, or simply well-learned.
One term for a person blessed with wisdom is a "sage." This individual is highly knowledgeable, insightful, and often sought after for their wise counsel and guidance.
A person with many talents is often referred to as a "polymath." This term describes someone who is knowledgeable and skilled in multiple areas, excelling in diverse fields such as art, science, and humanities. Polymaths are celebrated for their ability to integrate knowledge from different disciplines, fostering innovation and creativity.
A depraved person is often called wicked, corrupt, or immoral.
A person who studies prison management is often referred to as a criminologist or a corrections officer. These individuals are knowledgeable about various aspects of the criminal justice system, including the operation and administration of prisons. Their work involves understanding and implementing policies and practices to manage and rehabilitate inmates effectively.
A person who studies a lot is often called a "bookworm" or a "knowledge enthusiast."
ambivalent
A person who has an idea to share is often called a visionary, innovator, or thought leader.
A person from Gibraltar is called a "Gibraltarian" and Gibraltarians often also call themselves Llanitos.