How do you learn how to write japanese Kanji letter?
I found very useful website for the stroke order of Kanji↓
http://kakijun.jp/ (for web browser )
http://kakijun.jp/m-s/ (for smartphone)
I'm going to introduce how to use this web site
For Web Browser
1. paste a Kanji which you want to know
There is a small bar on the upper left of web site(red circle in under the picture)
Enter or paste here a Kanji you want to know how to write
For example, I paste the letter "木 (tree)"
2. click the search button on the right of the bar
3. After that, an animation of the stroke order starts with new page
It is very easy and useful!
It is almost similar with for web browser.
Paste a Kanji into the bar. After that, touch the search button ("検索").
The animation of the stroke order begins.
It helps you great!