The hardest part of learning Korean is not learning the vocabulary, but learning how to put the Korean characters together and spelling. Even as a native speaker, I find spelling difficult. Don't be intimidated though, it's not as hard as Chinese (Mandarin nor Cantonese). 

If these characters, ㅈ ㅊ ㄷ ㅅ ㅆ ㅌ, are written at the bottom of a set of charcters, it'll sound like a t no matter what character it is so it'll be pronounced

ie. 엊 should be pronounced eoj but is bow pronounced eot

No matter what vowel or whichever of the characters listed above are used, this rule will apply.

One exception however, is when the next set of characters "begins with" ㅇ

ie. 잊어 (to forget) should be pronounced iteo according to the rule, but because the second set of charcters begins with ㅇ, it becomes ijeo.

A Korean word can range from one set of characters 밥 (bahb~ food) to 2 추억 (choo-uhk~ memory) to 3 지하철 (ji-ha-cheol~ subway) and more 할아버지 (hal-ah-beo-ji~ grandfather)

A set of characters can consist of 2-5 characters:

Minimum of 1 vowel and 1 consonant

Maximum of 2 vowels and 3 consonants

Some vowels can't be put togegher in a set of characters. Some of the less obvious ones being:

ㅗ & ㅓ

ㅜ & ㅏ

ㅡ & ㅏ

ㅡ & ㅑ

ㅡ & ㅕ

ㅡ & ㅓ

ㅡ & ㅐ

ㅡ & ㅔ

ㅡ & ㅒ

ㅡ & ㅖ

The others like ㅏ & ㅓ are a lot more obvious.

An example of a set of 4 characters is 읽 (eelg) which is part of the word 읽어 (eelg-eo~ to read)

Bonus word of the day: 로망 (romang~ something you desire-- like a dream)

Usage: 제주도 (jeju-do~ Jeju Island) 가보는게 (gah-bo-neun-ge~ try going to) 나의 (nah-eui-- now proounced as nah-eh in modern Korean~ my) 로망이다 (romang~ dream)

Going to Jeju Island is my dream.

We'll start on the vocab stuff next chapter I promise ><