<ref> is the only mandatory parameter and the options are:
<branch_name>, or <branch_id> if you want to checkout a branch.
<commit_id> or <tag_id>, if you’re checking either of them.
When checking out, there might be some local pending changes or incoming shelved changes. You can specify what to do in each case:
[--take-changes] If your worskpace contains any changes, take them with you to the checked out target.
[--shelve-changes] If your workspace contains any changes, shelve them for later use.
[--discard-changes] Discard any changes in the workspace.
[--apply-shelf] If the branch to be checked out contains any previously shelved changes, un-shelve them after check out.
[--ignore-shelf] If the branch to be checked out contains any previously shelved changes, ignore them and don’t prompt to apply them.