Did you know that Hiragana and Katakana were originally kanjis? After Kanji was imported to Japan, kanjis were only used to write any word (the same way China does). However, since Japanese words sometimes were too long, it took a long time to write any word. Therefore, Japanese people started making new characters from the fast handwriting style.
The table above shows the evolution of each kanji into a kana character. I thought that would be interesting for the kanji learners!