How to get back to most recent version in Git?

git checkout master should do the trick. To go back two versions, you could say something like git checkout HEAD~2, but better to create a temporary branch based on that time, so git checkout -b temp_branch HEAD~2

When you checkout to a specific commit, git creates a detached branch. So, if you call:

$ git branch 

You will see something like:

* (detached from 3i4j25)
  master
  other_branch

To come back to the master branch head you just need to checkout to your master branch again:

$ git checkout master

This command will automatically delete the detached branch.

If git checkout doesn't work you probably have modified files conflicting between branches. To prevent you to lose code git requires you to deal with these files. You have three options:

1. Stash your modifications (you can pop them later):

   $ git stash
   

2. Discard the changes reset-ing the detached branch:

   $ git reset --hard
   

3. Create a new branch with the previous modifications and commit them:

   $ git checkout -b my_new_branch
   $ git add my_file.ext
   $ git commit -m "My cool msg"
   

After this you can go back to your master branch (most recent version):

$ git checkout master