About the Linux command ls

When we use the ls command ,there are a lot of things we need to understand.
Firstly, the output of the ls command:

As what is showed above,in the middle of the photo,there are 2 columns.First word is the user ownership  of this file,and the second one is the  group ownership  of this file.
If we want to change the user,do it like this:
chown  user directory
change the group:
chown :group directory

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