Learning Linux system directory

1, are not in the company linux interface
 
2, the system path
    2,1 / indicates the root directory
    2,2 ~ represents / root
    2,3etc: profile storage system
    2,4 home default, all users except root at home
            New a user name as the folder name of the file
            2,4,1 user xxx to / home / xxx has full control permissions to
    2,5 root user a separate folder
    2,6 usr all users to install software to put in this folder
             2,6,1 in a new tmp usr / local, all the archive
           are uploaded to the tmp
  
3, common commands:
    3, 1 pwd: print working oysters
4 different user login
      4,1 ordinary users
       4,2 root user
5,