Sonobazuki is the most basic punch there is within Karate.
This Japanese writing for Sonoba translates into "on the spot". The Kanji 'Ba' itself means place or location.
You can use several different kind of stances for Sonobazuki. Naihanchi dachi is the standard choice for Wado techniques and internal development.
Of course - other stances can be used. To get the best out of your training, learn the advantages of using each stance.
I would like to share a training method with you, which empasises squeezing the elbow. Have a look at the pictures below, where you can see the transition between the punches clearly. Training-wise, you can actually do the transition, so that you can emphasise squeezing the elbow. I demonstrate this method in the video where I also mention the key points.