As a noun:
* "The legend of Robin Hood has captivated people for centuries." (referring to a story)
* "The band's lead singer is a living legend in the music industry." (referring to a famous person)
* "The map key, or legend, explained the different symbols used." (referring to a map key)
As a verb:
* "The stories of his adventures have been legendized over time." (meaning to make something legendary)
You can also use "legend" in a more figurative way:
* "The athlete's speed and skill are the stuff of legend." (meaning something is very impressive)
* "She became a legend in her own time, known for her generosity and kindness." (meaning someone is very famous and admired)
The best way to use "legend" in a sentence depends on the context and what you want to convey.