My Short Diary.

I love black coffee. because it very nice tastes,
and smells good.
I need coffee beans every morning.

Another way to correct this entry could be:

1) A short diary.

2) I love black coffee. because it has a very nice taste, and smell.
3) I need coffee beans every morning.

1) A title doesn't need puncuation if you choose not to include it.

2) This can be one sentence. If you would like it to be two sentences try not to start a sentence with "because" if you can avoid it.

3) Also your last sentence could read: "I need coffee every morning." to make a bit more sense. The way you wrote it seems like you need the beans instead of the drink. :}

Good job though! Hope your learning goes well!