If you want to learn Japanese, first step is kana - Japanese writing system, after that you can learn grammar and kanji. Daily Kana is program, which will be showing some kana character on your home screen every 24 hours.
Tap on widget to see more information about character, there you can see its pronunciation and writing.
Also, app contains red and blue labels, it means:
red - katakana
blue - hiragana
And you can change character on widget at any time.