I bought a flute in the key of F to learn, and I'd like to ask if anyone has any popular songs or classic flute tunes in the key of F to introduce to the audience

Playing on a flute in the key of F doesn't necessarily mean it's in the key of F. It's not in the key of F after going through the fingering changes.

There are a lot of solo flute songs played in the key of F, such as <Spring to Xiangjiang River', 'New Song of the Herdsmen', 'The Little Eight Roads', and so on.

Popular songs can be performed on the flute as long as they are in the same key, such as "Nine Sisters" and "Jiangnan". But these tunes will probably have to be transposed to fingering.

The key of F: "Dreaming of Water Country", "My Motherland", "Song of the Young Pioneers", "I Love Tiananmen Square in Beijing" ......

Also, a lot of the tunes in "Dream of Red Mansions" are in the key of F