Clarify something for me?

ok i recently started watching Naruto but not from the beginning, i just turn my head and watch whenever it's on TV and i'm doing nothing. but something REALLY confuses me, are the shadow clones solid objects or are they illusions or something? sometimes they say "only one of them can hurt me" and then other times you can CLEARLY see them doing things that only a solid object can do.....so yea.....feel free to call me a noob.....

 

Naruto's shadow clones are solid clones. They are killed very easily, but they are real clones.

 

oh are only HIS clones solid objects then?

 

From what I remember, there are MANY types of cloning techniques. Some are just illusions, some are solid. Naruto is praised for being so young and having enough chalkra to form as many solid clones as he can.