i read from some tutorial and have tried to get it work bui it's still confusing me.

can anyone explain to me in every detail of doing "project curve"? please???

in tutorial that show me "how to make fish" said that body of fish has been made by nurbs and then eyes model by using "project curve" and loft ... ?? (this bit is confusing me) and how can we combine eyes and body together

this is the site of tutorial
https://members.aon.at/bulletin/sushi/

thank you