Hi @Soykot_Hosen you clearly know your subject. Just be aware that people all over the world watch our videos. Be extra careful with your speech, I thought we were downloading something called hello ht, try slowing down the way you say it. I am an Aussie and had to really slow down my talking so people could understand me. Other than you the sound is loud and clear, with no background noise.
Good luck - follow Udemys excellent guides of course creation and enjoy the process.
Sharon Ramel Spiritual Guide, Shaman, Priestess of the Blue Rose