Korean · Pronunciation Guide
ba-kku-da. The middle consonant is a tensed ㄲ, so it needs a locked throat and no puff of air, even though vowels sit on both sides of it.
bakkuda
Three blocks delivered flat. The word doubles as a test of whether your tensed consonants are real, because this ㄲ is surrounded by vowels -- precisely where a plain ㄱ would voice into a g -- so if the middle consonant sounds like a g, the tension is missing.
Listen: 바꾸다
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일을 바꾸고 싶어요.
Ireul bakkugo sipeoyo.
I want to change jobs.
Listen: 일을 바꾸고 싶어요.
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일을 바꾸고 싶어요 conjugates to 바꾸고, and the plain ㄱ of 고 does voice between vowels, so the word ends up containing a tensed ㄲ and a soft g back to back. Hearing those two consonants inside one word is the clearest available demonstration of the contrast.
The near-universal error is a plain or aspirated middle consonant, giving 바구다 or 바쿠다, and neither is a word. Build pressure with the throat closed and release without breath. Learners also start with a full English b, when the initial ㅂ has almost no voicing and sits closer to the p in 'spa'.