Great job, Min, in writing about an activity that requires multitasking.

Here are some corrections:

From two weeks ago, I started to learn how to play guitar. It seemed interesting-singing while playing guitar, but who knew it?! It is such a hard job. First I need to give attention to code, and accent, and if I can, I need to sing also. It doesn't seem hard, but you need to try it. If it's first time, left hand-the one you're grabbing strings-does hurt a lot. Thus, putting accents to stroke is quite hard. And singing? Ha, I couldn't do that! I couldn't sing at the same time as I am playing the song. So I could only do two things at once, grabbing and stroking. It may seem easy-playing and singing together- but it actually doesn't!

>>Two weeks ago, I started to learn how to play the guitar. It seemed interesting--singing while playing the guitar, but who knew it? It is such a hard job. First, I need to give attention to the code and accent, and if I can, I need to sing also. It doesn't seem to be hard, but you need to try it. If it's your first time, your left hand--the one you use in grabbing the strings--does hurt a lot. Thus, putting accents to stroke is quite hard. And singing? Ha, I couldn't do that. I couldn't sing and play the song at the same time. So, I could only do two things at once, grabbing and stroking. It may seem easy--playing and singing together--but it is actually not.