"The Song of Wandering Aengus" is spoken by Aengus, the Celtic god of love and beauty. But in Yeats' poem, he doesn't seem like a god. He just seems like a regular dude. After all, he goes fishing, gets tricked, and grows old—just like the rest of us. The poem begins with Aengus going off into a hazel wood to do some fishing. He makes a fishing rod out of a hazel stick (or "wand"), hooks a berry to it, then dips it into a stream. He lucks out and catches a trout.
In the second stanza, Aengus describes laying the fish on the floor and then starting a fire. He's about to do some cooking. But then he hears a rustling noise and someone calling his name. When he looks, he sees that the trout has turned into a beautiful "glimmering girl" who calls his name again. Aengus is smitten, but he doesn't even get a chance to chat up the girl. She runs and disappears into thin air.
The third stanza jumps way forward in time. Aengus is now an old man, and he's spent his whole life looking for the "glimmering girl" who appeared to him that day when he was out fishing. Even though he's old, he's determined to find out where the girl has gone. He imagines that, when he finally finds her, he'll kiss her and hold her hands. He also says that he and she will walk among grass, and together they'll pluck the "silver apples of the moon" and the "golden apples of the sun" until the end of time. Aww, isn't that sweet?