All words in Korean are composed of syllables, which follow these basic rules:
So let's put the ㄴ (n) and the ㅏ (ah) together into a syllable that fits into a square box: 나
You'll notice that the consonant (n) has changed its shape a little to accommodate the vowel that has joined it in the square box.
How do you think this syllable is pronounced? If you said na before looking at this text, you are right.
Here are two more consonants:
ㅁ, which is pronounced like the m in mother.
ㅎ, which is pronounced like the h in hot.
Try to figure out how these syllables would be pronounced:
마 하 나