Short answers, pulled from the story.
Sochi is the Russified form of the Circassian word Shchache, which derives from the Ubykh word Shuacha, a compound of two Ubykh roots meaning sea and side. The name roughly translates to seaside or coast. A secondary theory from Georgian sources links it to the Georgian word for fir tree.
The 2014 Winter Olympics in Sochi cost approximately US$51 billion, far exceeding the original budget of US$12 billion and surpassing the estimated US$44 billion cost of the 2008 Summer Olympics in Beijing. Russian politician Boris Nemtsov cited allegations of corruption in the construction process.
By the end of the Russo-Circassian War, Russian forces killed or expelled almost all the Ubykhs and a large portion of the Circassians from the territory of modern Sochi in what is known as the Circassian genocide. Russian sources recorded the area's population falling from roughly 100,000 to 98.
Yevgeny Kafelnikov, born in 1974 and a former world number one, spent much of his childhood in Sochi. Maria Sharapova also trained at a local tennis school there before relocating to Florida at the age of seven. Both went on to win Grand Slam titles.
Sochi stretches for 145 kilometers along the Black Sea coast, making it the longest city in Europe by territory. Greater Sochi covers over 3,502 square kilometers in total.
Sochi hosted the Formula 1 Russian Grand Prix from 2014 to 2021, FIFA World Cup matches in 2018 at the Fisht Olympic Stadium, and the 2014 World Chess Championship between Viswanathan Anand and Magnus Carlsen in November 2014, which Carlsen won.