Start with this general series on phonology so you have the background knowledge: https://www.youtube.com/watch?v=MTCx2hCxvHQT. It's all pretty brief but a decent simple primer. Then just poke around youtube, you'll find stuff to expand on both phonology generally and Spanish phonology in particular.
folks, taking time to learn the linguistic rules of a language is very helpful
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Start with this general series on phonology so you have the background knowledge: https://www.youtube.com/watch?v=MTCx2hCxvHQT. It's all pretty brief but a decent simple primer. Then just poke around youtube, you'll find stuff to expand on both phonology generally and Spanish phonology in particular.