The following links are helpful in Kathak since we also follow the book of Abhinayadarpan as base for all gestures. 

​Lehra and Theka App: Kathak Studio (for iPad and iPhone)

How to Wear Kathak Ghungroos

Asanyukta Hasta Mudra (Single Handed gestures)

Sanyukta Hasta Mudra (Double handed gestures)

Neck Movements (Griva Bhed)

Eye Movements (Drishti Bhed)

Head Movements (Mastak Bhed)

Teentaal Vilambit Laya Music

Level 1 & 2 Theory notes