Pinyin initials j, q, x

Tip of how to make the sound of  ' j ' :

First the tip of your tongue reaches forward to touch the back of your lower teeth, with the front of the tongue rising to touch the hard palate. Then you should relax your tongue to form a narrow gap between your tongue and hard palate, and at the same time blow the air through the gap to make the sound.

As for ' q ', the method is the same as for ' j '. But you need to blow the air harder.

Tip for how to make the sound of  ' x':
First the tip of your tongue reaches to touch the gum line of the back of lower teeth, with the front of the tongue rising to be close to the roof of your mouth, and a narrow gap will form between your tongue and the roof of your mouth. Then you blow the air through the narrow gap to make the sound.