How to get the music on my computer to my IPhone?

I have the music from my old SD card on my computer and I would like to get it on my IPhone, how would I do this?

(connect your iphone to your computer)

1.transfer the music into Itunes: right click, go to open with, then it should give you options, click the one that says itunes.

2. It should then open itunes and you should see the songs.
then right click the songs one by one go down to where it says add to playlist

3. After it should say something iphone for me it says owners iphone because that what it was named on my computer then click that and it should appear in your music if not sorry.