Hey guy's R4GE VipeRzZ here, and today I'm going to show you how you can move a single vertex in Blender.
This should help you solve the problem where when you try to move a single vertex it moves the whole object in Blender. This issue is most likely caused by accidently turning on Proportional Editing.
Proportional Editing can be toggled by click on the icon in Edit mode or by pressing the O key on the keyboard.
In this video Blender 4.2 was used.