a more natural one would be "今日（きょう）私は日本語を勉強しました。" 1) Use Kanji for "きょう” instead of Hiragana. 2) use "しました” instead of "した” cause it makes the sentence more polite. When you use "私は” it makes your sentence somewhat polite already, so in order to keep the tone of your sentence polite, use "しました” If you want to use "した” (which makes the sentence sound more bold, assertive) , then drop "私は” entirely, and just say "今日、日本語を勉強した。”
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