in french it kinda seems hard to understand .can any one help please?
"Passé composé" is easy. Vanessa has explained it well.
"Participe passé" is simply a form of the verb. Like in English, you have the infinitive, par exemple, "chanter". You have the participe passé : "chanté" (used in the "passé composé"), and another form as well : "participe présent" ("chantant"). That is not very different from English : "to write", "written", "writing". OK ?