Harry Potter, Ron Weasley and Hermione Granger.
The Golden trio are the three main characters in Harry Potter: Harry, Ron, and Hermione. They are called the golden trio because they are "golden", or really important to the story line and they are a trio, which means three.
It means you have been thinking about Harry Potter, either consciously or unconsciously.
Zacharias Smith, a Hufflepuff student in the same year as Harry Potter. He was a member of Dumbledore's Army and was strongly disliked by the trio.
The Golden Trio of the Harry Potter series included three people. The trio of three sang to their loves together in harmony.
Hermione Granger is Harry Potter's best friend besides Ron Weasley. Hermione is the 'smart' one of the trio, and the only girl.
There are three of them which explains the trio and they are 'golden' because they represent good and banished evil.
The Golden Trio.. . .A.k.a., Harry, Ron, and Hermione. While running in the forest, they are caught by Snatchers, wizards that are trying to make money by catching wanted people. When the Snatchers find out that the trio caught includes Harry, though, they take Harry, Ron, and Hermione to Malfoy Manor.
The phrase 'the Godlen Trio' in referrence to Harry, Hermione, and Ron is never used in the Harry Potter series. The phrase has been around since the early days of the Harry Potter Fandom (fanfiction, fan art, etc.) and is still commonly used today. In all likely hood the phrase was coined by an early fanfiction author, stuck, and became so popular it might as well be canon.
*WARNING* SPOILERS AHEAD At the end of the seventh Harry Potter book (Harry Potter and the Deathly Hallows), there is a chapter "19 Years later" when the trio have all grown up. Ron and Hermione have ended up as a couple and have two children, Rose and Hugo. Harry ends up marrying Ginny Weasley, and they have three children together, James (after Harry's father), Albus Severus(after the "two greatest headmasters of Hogwarts"), and Lily (after harry's mother).
They attended Hogwarts for the first time when the were 11, and the series ended with them being 17.
Most likely considering a clip from Harry Potter and the Deathly Hallows will be shown and the main actors tend to be the ones to present it.
there were some speculations that j.k. Rowling would continue to write books but it wouldn't be adventures of the trio this time