How to take music off of my mac book pro an put it on my iphone?

I have recently bought songs on my macbook pro from itunes. I'm really bad with technology and don't understand how to put the songs i want from my massive itunes library into my phone. I have tried making a playlist and dragging it into my phone's music but it doesn't load on.

You have to hook your iphone into the mac with the cord open up itunes and just copy all the song you want on your iphone and drag and drop them over the iphone and it will sync them.

Connect your iphone on its wire onto your mac book. And itunes will open up, and drag the files/songs you want onto your phone.