My first suggestion is to forget any website that uses improper romanization like TenguGo does. Besides, the quality of the audio files is very bad. Learning Korean pronunciation in English is very difficult because the letters ㄱ, ㄷ, ㅂ and ㅈ romanize as G, D, B and J at the beginning of a word (NOT K, T, P, CH), but they do not sound like the English G, D, B and J at all. It's all about "imitating", you have to listen to clear audio files and try to reproduce the same sounds. ^^ 도시 romanizes as 'doshi' but the D represents a Korean sound, you shouldn't "read it in English". I don't know if you get what I mean. And ㄷ 받침 does romanize as a T but again it's not like an English T at all. In fact it's not even a real sound, it's more like a "stop", you just touch your teeth with your tongue.

I second what Hyejeong says. You should find a good source, either a good tutor or a good site or book depending on how serious you are. It is crucial to get the basic consonant and vowel sounds right since everything is built from them. The pronunciation rules may overwhelm you if you read about it, but they rarely matter if you get the basics right like the natives. Most Koreans aren't even aware of any phonetic rules but still speak it perfectly. The rules essentially describe what happens when an average Korean pronounces certain phonemes in sequence. So if you have rock solid foundation on the basic sounds, you can pronounce most things correctly without knowing the rules for their own sake. All this also means that even native Koreans are not always a good teacher. Many uninitiated Koreans think ㄱ sounds the same as G, ㄷ as D, etc. because they have never actually sat down and thought about it. Only someone who has expertise on this subject, or a site that has well thought out explanations will help you.