Rocky, as I see it, learning to write in a new language is important too, as is knowing what words mean or how to pronounce them and use them in sentences. I am an excellent speller in English, but I have noticed that I sometimes misspell new Spanish words, especially when typing words I do not know into translators. This has caused me to pay close attention to these words and has helped me learn them faster. Writing words correctly has also made me more aware of the importance of accent marks, and how the meaning of some words change with or without them.
Punctuation and capitalization is important as well, they are all parts of knowing any language. So the short answer to your question is, learn how to spell as well as pronounce and know how to use Spanish words.