Thaa ثَاء
Like 'th' in thin: tongue tip just out between the teeth. Three dots.
Its shapes
Trace it with your finger
👄 Where the sound comes from
The tongue and the front teeth · ث
The tip of the tongue touches the edge of the top front teeth.
⚖️ Don't mix it up with
- س
Seen
Like 's' in sun, a light whistle. Three teeth.
Say Thaa and the other letter one after the other, slowly, and feel the difference. A teacher can check you.