Learn Hardcore Japanese: hai, mainiti kanzi wo rensyuusimasu.

In Japanese it’s common to omit the subject when it’s clear from context. Here, because you’re talking about your own habits, the subject “I” (私) is understood even though it’s not stated. Adding 私は at the start (私は毎日漢字を練習します) is grammatically correct but often unnecessary in casual conversation.

What role does the particle を play in 漢字を練習します?

The particle を marks the direct object of the verb. In 漢字を練習します, 漢字 is what you’re practicing, so を shows that 漢字 is the target of the action 練習する (“to practice”).

Why is 毎日 placed without a particle, and can it go elsewhere?

毎日 is an adverb of frequency (“every day”), so it doesn’t need a particle. Adverbs in Japanese are flexible in placement. You could also say:
• 漢字を毎日練習します
• 漢字を練習します、毎日 (less common)
But putting 毎日 at the front (毎日漢字を練習します) is the most natural and emphasizes the habit aspect.

Could I instead say 漢字の練習をします? What’s the difference?

Yes, 漢字の練習をします is perfectly natural. Here you’re making 練習 (“practice”) into a noun phrase 漢字の練習 (“the practice of kanji”) and then を marks that phrase as the object of します (“to do”). Functionally it means the same thing, but:
• 漢字を練習します focuses on the action practice directly applied to 漢字.
• 漢字の練習をします highlights the activity practice as a thing you do.

What does 練習します mean, and why use this verb form?

練習する is the noun-verb compound meaning “to practice,” made polite by the ます-form 練習します.
• 練習する = “to practice” (dictionary/plain form)
• 練習します = polite present/future tense (“(I) practice / will practice”)
You use します here because the sentence is polite (e.g., in a classroom or talking to someone you respect).

Why is there はい at the beginning, and do you need the comma after it?

はい means “yes” or “indeed.” It’s used here to affirm or agree—often as an answer to a question like “Do you practice kanji every day?” The comma (、) simply indicates a slight pause in spoken or written Japanese. It’s optional but makes the pause clearer. You could also drop はい entirely if you’re just stating a fact: 毎日漢字を練習します.