Maybe it'd be better for you to watch some pronunciation video in youtube or what not. I guess in English (Sorry but I don't know anything about Spanish) there's not a word with ㅃ,ㅉ,ㄸ,ㄲ sound, so it's hard to put the explanation into a word.

ㄱ is in between /g/ and /k/. ㅋ is an aspirated sound of ㄱ. You can feel the air comes out of your mouth when you say ㅋ. It sounds like /k/. ㅋ is made in a higher pitch than ㄱ. ㄲ : Have a little pause before you say this sound. Tense your voice and mouth and say it without any aspiration. ㄲ is made in the highest pitch. Other consonants work the same way. I'd like to share this video link which is really useful for your question. https://www.youtube.com/watch?v=Gg-VZxBIZjo&t=426s Hope it helps and please follow me at koreanclass.canada on Instagram!

ㄱ-예사소리: you sound it as you don't make the neck muscle tense and don't breath out strongly ㄲ-된소리:you sound it as you make the neck muscle tense slightly ㅋ-거센소리:you sound it as you breath out strongly

Es difícil poder distinguir estos sonidos al principio. Es importante practicarlos pero la verdad es que esa habilidad vendra con el tiempo! Ponte a escuchar mucha música a ver programas de televisión en coreano para que se vaya acostumbrando tu oído :)

g gg k it is something like that :D