$ git clone https://example.com/user/project.git
$ ls
project

$ git init
$ git remote add origin https://example.com/user/project.git
$ ls
project
$ cd project
$ git pull origin master

#Pull the contents of the master branch in the remote repository (origin) to the current branch in the local repository
$ git pull origin master
$ git pull  #origin and master can be omitted.

$ git fetch origin master     #Obtain information only on the master branch of the remote repository (origin)
Ref：$ git fetch origin   #Get information about all branches in the remote repository (origin)

$ git log  #Confirm changes
$ git checkout origin/master    #Switching work trees
                                #Check the contents of local information for tracking
                                #Information on the master branch of the remote repository (origin)
$ git checkout -a       #List all branches
$ git checkout master   #Switch work tree to master branch; master can be omitted


$ git merge origin/master    # Merge current branch with origin/master

Git - How to use Git.