Start with a small set of sounds
Hangul is the Korean alphabet. Its letters combine into blocks, and each block represents a syllable. You do not need to memorize the whole alphabet before reading anything. Begin with six useful vowels: ㅏ, ㅓ, ㅗ, ㅜ, ㅡ, and ㅣ. Then add a few consonants such as ㄱ, ㄴ, ㅁ, and ㅅ.
Use romanization as temporary support. The letters eo in ㅓ represent one Korean vowel, not an English e followed by o. Likewise, eu in ㅡ represents one vowel. Listening to Korean audio and imitating the sound is more useful than trying to invent an English pronunciation rule.
Learn the block, not just the letter
A vertical vowel sits to the right of the initial consonant: ㄴ + ㅏ becomes 나. A horizontal vowel sits below it: ㄴ + ㅜ becomes 누. A vowel-initial syllable uses silent ㅇ in the initial position, so ㅇ + ㅏ becomes 아.
Read one block at a time and then join the blocks. 나무 has two syllables, 나 and 무, and means tree. 나라 has two syllables, 나 and 라, and means country. These small words turn an abstract alphabet into something you can recognize.
Add a final consonant
A consonant at the bottom of a block is called 받침, or batchim. In 한, the bottom ㄴ ends the syllable. Do not add an extra vowel after it. The letter ㅇ is silent at the beginning of a block, but it sounds like ng at the end, as in 강.
Spelling and connected pronunciation do not always match one letter at a time. In 집에, the final ㅂ links to the following vowel, so the phrase sounds approximately like ji-be. Learn this through familiar examples before trying to memorize every pronunciation rule.
Try a ten-minute routine
Spend two minutes recognizing familiar letters, three minutes reading a few words aloud, and three minutes listening and matching what you hear to the written form. Use the last two minutes to recall words without looking. Keep the set small enough that you can revisit it tomorrow.
If you confuse two letters, compare them directly. Read 아 and 어 side by side, listen, then hide the labels and try again. A focused contrast is more helpful than restarting the entire alphabet every time you make a mistake.