Basic finger position on left had is ㅂ,ㅈ,ㄷ,ㄱ.
Basic finger position on right hand is ㅜ,ㅗ,ㅣ,ㅏ.
Basic thumb position on the left and right is anywhere on the bottom row.

To create harder sound of ㄲ,ㄸ,ㅉ,ㅃ, you push respective single keys with right side keys simultaneously. For instance to type ㄲ, you should type ㄱand ㅇ at the same time.

To create harsh sound of ㅋ,ㅌ,ㅊ,ㅍ, you need to push ㄱ,ㄷ,ㅈ,ㅂ,with ㅎ at the same time.

These principles are applicable both Initial and trailing consonants.

To create double or triple vowels, you just push the respective vowels at the same time. For instance, to make ㅢ, you need to push ㅡ and ㅣ at the same time.
To make ㅞ, you need to push ㅜ,ㅓ,ㅣ at the same time.

Sentence marks: such as ‘.’ ‘,’ and ‘?’ can be simultaneously inputted.

Space bar can be pushed at the same time to save strokes.

Sentence marks and space bar can be pushed same time, and sentence mark comes first and then the space comes after it.

You can type serially until your fingers are familiarized with each key position. Once you have mastered it, then, you can type mighty faster way, just like shorthand typist, pushing syllabic character all at once. Bingo! You are fastest typist in the world whatever language it may be.