The most useful resources for studying Persian

These are some resources on the Internet which I found the most useful for studying the Persian language:

http://www.jahanshiri.ir

https://www.easypersian.com

https://fastdic.com

http://www.mypersiancorner.com

https://www.persianlanguageonline.com

http://sites.la.utexas.edu/persian_online_resources/