How to download music from Apple Laptop to iPhone 4S?

Okay, my dad just got this Apple laptop and I know how to download music off from a Windows computer but not a Apple laptop. I got the iPhone 4S in July and I'm wondering if anybody knows how to download music off of an Apple laptop to iPhone 4S.
I have been searching for the answer but they are very confusing. I'm trying my best to get more music on my iPhone but I don't know how from an Apple laptop.

ITunes should already be installed. Add your music collection to iTunes, plug in the phone and sync.

Go through this steps…

1. You open iTunes on your laptop and click on your iPhone's name on the left hand side. After the page opens on the top you will see "Summary", "Info", "Apps", "Tones", "Music", "Movies"… Etc.

2. Click on "Music". Put a check mark in the field "SYNC MUSIC" and choose "Entire Music Library" on the drop down menu below.

3. Click on "SYNC" on the bottom right of the screen

Wait until it has finished syncing and you're all set.

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