How to download songs onto my iphone? - 1

I have an iPhone 4 and all the free music apps suck because they don't let you download the music so it takes Wi-Fi or data which means it takes a long time to load in between songs.
So how do I download songs using my computer to my phone? I know it's possible because my friend does it and he says it's easier because the music goes to the phones music player.
Please use as much detail as possible
Also when I plug my phone in iTunes on the computer confuses and scares me haha
Any advice is helpful thank you!

Added (1). there are a lot of tutorials on youtube if you could just give me a link. I have a windows computer not the newest version though. Also can I trust these tutorials to not give my viruses when I download
Please use as much detail as possible
Also when I plug my phone in iTunes on the computer confuses and scares me haha
Any advice is helpful thank you!

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