How do tags work in Git?

Question

git

Some time ago I downloaded the repository to my local computer. After that, others continued to develop it, adding new commits to the develop and master branches. Also added tags (3.1-beta, 4.0-beta) to some commits in the develop branch.
I need to convert the code in the current project folder to version 4.0-beta, for this I execute in its local folder:

git fetch
git checkout 4.0-beta
git status

The response of the last command is:

HEAD detached at с
nothing to commit, working directory clean

My understanding is that I have two copies of the project after cloning it with git clone: ​​local and local-synced (both available locally). After the git fetch command, the entire local-synced copy is updated. Then I switch to a commit with the 4.0-beta tag and, accordingly, all files in the current project directory correspond to this commit. Therefore, I can compile them and be sure that they are of this particular version. If I run git merge, the local-synced copy will be depleted from the local one. But in fact, I don’t have to do this if I don’t want to change these files, but only use them.
If my reasoning is wrong, can you correct it? Why does git status say Head Detached?

Answer 1

Yes, everything is correct in general terms. In addition to the point about git merge.
Head Detached because you checked out a specific commit, not a branch. Accordingly, you are not "located" in any branch. What the git tells you. You can do it git checkout -b my-new-branchand then this message disappears because you will create a new branch on the current commit and switch to it.

Answer 2

https://stackoverflow.com/questions/35979642/what-...