how to change background in photoshop tutorial for beginners class 22

My channel is GalaxiesGraphics and I am a seasoned graphics designer trainer having experience of 5+ years.Ihave started this training for anyone who wants to learn about Graphics Deaigning in a propfessional way.
Following softwares you cover or learn from my videos
2DGraphics
3DGraphics
Photoshop
Illustrator
Autodesk Maya
3DMax
4DCinema
Also I post some health related videos.

Galaxies Graphics
#how to change background in photoshop tutorial for beginners class 22