Is Sun rotating anti clockwise similar to planet Venus or is it continuously changing it rotation ?
The sun rotates in anti-clockwise direction (when viewed from the north).
The Sun, however, does not rotate as a whole body. It is made up of gaseous plasma and the time taken to complete one rotation increases with latitude. It takes around 25 days at equator and 38 days at poles (it is judged by the location of sun spots).