git

Lost commits — reflog recovery

fatal: bad default revision 'HEAD'|reflog.*not found|HEAD is now at

Fixes

1.Find the lost commit SHA: `git reflog` shows all recent HEAD movements
2.Restore with: `git checkout <sha>` then `git checkout -b recovery-branch`
3.Reset to it: `git reset --hard <sha>` (if on the correct branch and sure about losing current state)

reflogrecoveryreset

CONFLICT \(content\): Merge conflict in (.+)

•Open conflicted files, resolve the <<<<<<< / ======= / >>>>>>> markers, then `git add` and `git commit`
•Use a merge tool: `git mergetool` (configure with `git config merge.tool <tool>`)

You are in 'detached HEAD' state

•Create a branch to keep your work: `git checkout -b my-branch`
•Return to a branch: `git checkout main` (commits in detached HEAD may be lost without a branch)

\! \[rejected\].*\(fetch first\)|failed to push some refs.*Updates were rejected