git

SSH permission denied

Permission denied \(publickey\)|Could not read from remote repository

Fixes

1.Check your SSH key is added to the agent: `ssh-add -l` — if empty, run `ssh-add ~/.ssh/id_ed25519`
2.Verify the key is added to your Git hosting account (GitHub/GitLab/Bitbucket Settings → SSH Keys)
3.Test connection: `ssh -T git@github.com` — if it fails, regenerate key: `ssh-keygen -t ed25519`

sshauthenticationremote

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