Conjunction Junction is the iconic song that was once played in between Saturday morning cartoons. It focuses on the conjunctions and, but, & or. This clip also explains to viewers what conjunctions are used for.
Grammer Bytes! has a good page with help for what coordinating conjunctions are and guidelines as well as examples for their usage. I like the mnemonic device above for remembering the seven coordinating conjunctions. FANBOYS is an acronym for for, and, nor, but, or, yet, & so.