why is my default scene is look bad.

I watched brackeys how to make a video game in unity series but his defult scene is way more better then mine why is that and even i change the anti aliasing setting to 8x still the edges is like pixelated how can i fix that ?

Hello I just created a account to tell you, I search through the comments and found out, I stopped cos of this until I saw you who has the same problem.

Window > Rendering > Lighting settings, auto generate lighting

You can set the colour and stuff to make it even better