I don't know how it works after creating the git branch master origin/master branch.

I cloned the develop branch, so I executed the following command to drop the master of the remote branch to the local branch.

Does this mean that you create a master branch locally and merge remote branches there?

I am not used to using git yet, so I would appreciate it if you could tell me more about it.
Thank you for your cooperation.

Synchronize remote branches.
git fetch
# Check the fetch remote branch
git branch-r
git checkout-b master origin/master

Add

Checkout is just switching branches, so I personally think the following is the content that I am concerned about.
I heard that the master is pulled from the develop branch and the master of the remote repository is pulled, and the pull is fetch+merge, so I think merge is working. What do you think?

 git branch master origin/master

The situation is that I cut the branch named master from git checkout-b master origin/master while I was in the develop branch and pulled it, but as far as git log shows, there was no evidence that the remote master was merged into the local master branch.

I think it has the same meaning as this, but if you do this, a branch with a commit below the specified commit log will be created.
If you set this to origin/master, a branch is created from the master latest commit log of the remote repository.
This will probably be a branch that is completely independent of development.
I wonder if it's going to have the image of a double pillar.Probably.

// Create a branch with a starting point
git branch <branch><commit>

See also

If you look at the article below, it says that the above is merging.
https://shu223.hatenablog.com/entry/20130115/1367342778

It has nothing to do with the question, but what should I do if I make a mistake in the parent branch derived from git checkout-b master origin/master and develop it as it is? https://www.granfairs.com/blog/staff/git-mistake-parent-branch