Add Change The Start Point Of A Branch as a git til

git/change-the-start-point-of-a-branch.md

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+# Change The Start Point Of A Branch
+
+More than a few times I have checked out a new branch against, say, `develop`
+when I instead meant to base it off `qa`. I've tried what felt like the obvious
+solution.
+
+```bash
+❯ git checkout qa
+❯ git checkout -b new-branch
+fatal: A branch named 'new-branch' already exists.
+```
+
+Git won't allow this. The fix I tend to go with is to delete the branch, move
+to my intended starting point, and check it out anew.
+
+Here is another approach. The `git checkout` command offers the `-B` flag which
+will save me a step.
+
+```bash
+❯ git checkout -B new-branch
+Switched to and reset branch 'new-branch'
+```
+
+Use this with caution. Any commits that have been applied to the subject branch
+will be reset (read: wiped out) in the process.
+
+See `man git-checkout` for more details.