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Katakana
46 basic characters, 104 in total once dakuten and combinations are counted. Tap any you want to work on, then practise them. Anything you drill goes into your review schedule automatically.
With dakuten and handakuten
The same shapes with two strokes or a small circle added. か becomes が, は becomes ば or ぱ.
Combinations
A small や, ゆ or よ after an i-row character glides the two together into one syllable.
Printable katakana chart · writing practice sheets, both free for classroom use.