Position game objects and set visibility
Unity enables you to place an object in the scene and then scale or rotate it. You can use the RectTransform feature to change the position of 2D objects, such as sprites. The Transform feature combines the move, rotate, and scale tools.
Parent object
In Unity, objects use a hierarchy system where objects can become parents of other objects. You can create game objects when you want that object to perform all the transform changes concerning the parent game object instead of the game world. You can create a parent game object simply by dragging and dropping the game object you want as a child object onto the object you want as a parent game object. When you're developing in Unity, you'll find that you create parent game objects frequently.
Prefab
Prefabs are distinct components that allow completely configured game objects to be retained in a project for future use. They are crucial elements used to carry out broad changes across the project. Any edits that you make to a Prefab asset are automatically reflected in all the instances of that Prefab. You can share these Prefabs between scenes or even other projects, without having to reconfigure them. It's a good idea to form Prefabs while you're working in Unity, so you can avoid rework in the future.
Scene Visibility
Scene Visibility control allows you to hide and show game objects in the scene without changing the in-game visibility. Scene Visibility is helpful while you're working on complex scenes with a lot of game objects. Using visibility is a preferred option over deactivating the game objects, because visibility only affects the scene view. This means that you can't accidentally remove game objects from a fully rendered scene. You can hide a game object by selecting the eye icon beside its name in the hierarchy window.