Hong Kong is a very special part of the world, it is not a country (although many desire it to be), but rather an SAR (Special Administrative Region) of the People's Republic of China. It has been this way since the UK handed it over to China in 1997, as it now operates with its own quasi-constitution (Basic Law of the Hong Kong SAR).
Under the "One Country, Two Systems" principle, Hong Kong is a Executive-led Electoral System, though in name mostly, since Beijing has gotten much control of the city and most parties in the legislative council (Hong Kong's Parliament) are Beijing Loyalists and can only be Beijing loyalists, they, along with the Election Comittee, choose the Chief Executive, who handles most political affairs. Nonetheless, Hong Kong still has more autonomy and a more distinct economy than the average Chinese province.
Still, Hong Kong functions as a semi-autonomous bastion of cantonese culture and identity, it may not be an official language but it is the most spoken along with English. It has given the world a lot in terms of Cinema and Music especially, with iconic actors such as Jackie Chan and Bruce Lee and musicians like Leslie Cheung. As such much of mainstream Cantonese culture originates and is centered in Hong Kong.
Despite increased and intense competition, Hong Kong is still one of the busiest areas for Sea trade in the world, with the efficient Port of Hong Kong handling over 13.69 million TEUs (twenty-foot equivalent unit), and the Kwai Tsing Container Terminals being the 12th-busiest container port in the world. Originally, This was the main cause of Hong Kongs economic development, but the economy has since diversified.
Speaking of the economy, the city has a massive economy and is considered one of the 4 Asian Tigers along with South Korea, Taiwan and Singapore. It has a high nominal GDP per capita of $59,640 and an HDI of 0.955 as of the 2020s, despite this it has severe income inequality and one of the highest density of billionaires in the whole world. Its economy is defined export-oriented and largely defined by sectors such as finance, tourism, trade and professional services.
While it originally started as an area of mostly farmers and fishing villages, it quickly became more and more industrialised, especially after the main Hong Kong island and Kowloon were conquered by Britain after the First and Seconds Opium Wars, these were to be kept in perpetuity but the New Territories, which were given in a lease, could only be kept by Britain for 99 years. After a brief period of Japanese occupation it was reoccupied by Britain where the industrialisation evolved into the iconic neon-and-skyscrapers aesthetic the city is known for today, the population also rapidly increased, as many mainland refugee waves came due to economic and political factors. Nevertheless, the future proved uncertain as riots and protests, like the riot in 1967 one that ended in violence, as well as the iminent end of the New Territories lease (In which the Main Island and Kowloon would have to be leased back due the logistical impossibility of separation.) created an uncertain future, eventually after diplomatic talks and agreements with China, Hong Kong given over, but with an autonomous government.
Demographically, the city is mostly made up of ethnically Han Chinese people, Mostly Cantonese, Hakka, Taishanese and other groups. With a minority of South Asian short-term workers and generational migrants and European expats. The Religious landscape is diverse, with many practicing the "Three Teachings" of Buddhism, Daoism and Confucianism with massive minority of Christians (mostly Protestant and Catholic) and some Muslims, as well as ethnically distinct Hindu, Sikh and Jewish minorities, despite this the vast majority identify primarily as irreligious or secular.
In terms of Geography, Hong Kong is humid and urbanised, but outside of urban areas it is dominated by Mountains and Jungles. It also has a problem with Air Pollution, which has been a concern since the 2000s. Hong Kong is also highly biodiverse, with animals such as the Burmese Python, Rhesus Macaques and Civets. Many are protected and found in national parks.
TL;DR: Hong Kong definitely does have neon lights and skyscrapers, but it has a lot of culture, biodiversity and an interesting but for many deeply troubling political scene. Which is still a lot for a densely populated city of 7 million people.