this is the full link for this lesson
Note: its better if u read this article in your laptop

https://www.howtostudykorean.com/unit0/unit0lesson1/

Note that the letters I teach you in these lessons in Unit 0 are not in
alphabetical order. Rather, I am presenting the most simple letters first, and presenting more complex letters later

here is the actual alphabetical order, which is separated into consonants and vowels:

consonants :ㄱ ㄲ ㄴ ㄷ ㄸ ㄹ ㅁ ㅂ ㅃ ㅅ ㅆ ㅇ ㅈ ㅉ ㅊ ㅋ ㅌ ㅍ ㅎ
Vowels :ㅏ ㅐ ㅑ ㅒ ㅓ ㅔ ㅕ ㅖ ㅗ ㅘ ㅙ ㅚ ㅛ ㅜ ㅝ ㅞ ㅟ ㅠ ㅡ ㅢ ㅣ

The following are the first set of Korean consonants that you need to get into your brain. There is no easy way to explain them, you just need to memorize them:
ㄱ= k
ㄴ= n
ㄷ= d
ㄹ=r/l*
ㅁ= m
ㅂ= b
ㅅ= s
ㅈ= j
ㅎ= h

ㄹ=r/l *(This sound is very difficult to write in English, and is the reason why people from Korea/Japan have trouble pronouncing the R and L sound in Engrish. The sound of this letter (to me) is half way between an R and L. For example, if you were to say “I hadda good time last night” the ㄹ sound is very similar to the “dd” in the slang “hadda.” It’s not quite an R, and it’s not quite an L.)

Next are the basic vowels you will need to know. Again, do whatever you can to memorize the English representations to help you learn them.

ㅣ = i
ㅏ = a
ㅓ = eo (Romanized as “eo” but it sounds closer to “uh” in English)
ㅡ = eu
ㅜ = u
ㅗ = o

You should notice that the first three vowels are drawn vertically, and the bottom three are drawn horizontally
Korean is written into “blocks” that make up one syllable. One block always has exactly one syllable. The blocks are ALWAYS drawn in one of the following ways:

https://www.howtostudykorean.com/wp-content/uploads/2012/04/2.png

Important rules you need to know about these structures:

1. Number “2” is ALWAYS a vowel. Always always always always always.
2. Number “1, 3 (and sometimes 4) are ALWAYS consonants. Always.
3. Blocks containing a horizontally drawn vowel are always drawn in one of these two ways:

https://www.howtostudykorean.com/wp-content/uploads/2012/04/3.png

4. Blocks containing a vertically drawn vowel are always drawn in one of these two ways:

https://www.howtostudykorean.com/wp-content/uploads/2012/04/4.png

Now that you know those rules, it is just a matter of putting the consonants and vowels together to make blocks. For example, if I want to write “bab”:

Step 1: Determine if the vowel is horizontal or vertical. a (ㅏ) is vertical, so we will use:

https://www.howtostudykorean.com/wp-content/uploads/2012/04/5.png

Step 2: Determine if the syllable ends in a consonant. Yes, it does. So we need to fill 1, 2 and 3, so we need to use:

https://www.howtostudykorean.com/wp-content/uploads/2012/04/6.png

Step 3: Place the starting letter “b (ㅂ)”, the middle letter “a (ㅏ)” and the ending letter “b (ㅂ)” into 1, 2, and 3 respectively

https://www.howtostudykorean.com/wp-content/uploads/2012/04/7.png

Let’s practice a few before we finish:
ㄱ = k
ㅏ = a
ㄴ = n
ㅏ is vertically aligned, so if we make a syllable we would write: 간 (kan)

ㅂ = b
ㅓ = eo
ㅂ = b
ㅓ is vertically aligned, so if we make a syllable we would write: 법 (beob)

ㅈ = j
ㅜ = u
ㅜ is horizontally aligned, so if we make a syllable we would write: 주 (ju)

ㅎ = h
ㅗ = o
ㅗ is horizontally aligned, so if we make a syllable we would write: 호 (ho)