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Common fixes to open first

If you are not sure where to start, choose the page closest to the error you are seeing. Each guide puts the copy-paste fix first, then explains the cause and the safer alternatives.

• ESLint and TypeScript version conflict — align compatible versions
• npm node-gyp build failed — install the required build tools
• npm ERESOLVE unable to resolve dependency tree — inspect peer dependencies
• git force pull — overwrite local changes safely
• git push rejected — fix a non-fast-forward error
• git push rejected — remove or track a file that is too large
• bash redirect stderr — combine or separate output streams
• Docker cannot connect to daemon — check whether Docker is running
• Regex basics — build patterns, groups, and boundaries safely

git — 33 pages

• Git basics — commits, branches, remotes, and safe recovery
• git amend last commit message — rewrite without a new commit
• git bisect — find the commit that introduced a bug
• git cherry-pick — apply a commit from another branch
• git clone a specific branch
• git delete remote branch — push delete
• git detached HEAD — what it means and how to fix
• git diff between two branches
• git discard all unstaged changes
• git force pull / overwrite local changes
• git push rejected — file too large
• git line ending warning (CRLF / LF) — how to fix
• git merge conflict — how to resolve
• git permission denied (publickey) — how to fix
• git pull --rebase vs --merge — which to use
• git push rejected (non-fast-forward) — how to fix
• git rebase --abort — cancel a rebase in progress
• git recover deleted branch — using reflog
• git remote change URL — switch origin or add new remote
• git remove all untracked files and directories
• git rename a branch (local and remote)
• git reset --soft vs --mixed vs --hard — the difference
• git revert merge commit — how to undo a merge safely
• git convert shallow clone to full history
• git show a file at a specific commit
• git squash commits — combine commits before merging
• git SSL certificate problem — how to fix
• git stash drop — remove a specific stash
• git submodule update — initialize and update all submodules
• git tag a specific commit — create and push tags
• git undo last commit — keep or discard changes
• git stop tracking a file — remove from git without deleting
• git worktree — work on multiple branches simultaneously

docker — 22 pages

• Docker basics — images, containers, ports, volumes, and debugging
• docker build failed — no such file or directory
• docker cannot connect to daemon — is docker running?
• docker compose env — pass environment variables
• docker container exits immediately — how to debug
• docker container IP address — how to find
• docker container name already in use — how to fix
• docker copy files — between host and container
• docker env-file — load environment variables from .env
• docker exec — run command inside a running container
• docker health check — HEALTHCHECK instruction
• docker image not found — pull or build missing image
• docker multi-stage build — reduce image size
• docker network — connect containers
• docker no space left on device — clean up disk
• docker permission denied /var/run/docker.sock
• docker port already in use — address already in use
• docker prune images — remove unused images
• docker pull rate limit exceeded — how to fix
• docker remove all stopped containers
• docker logs — view and follow container output
• docker volume mount — persist data with -v and volumes

bash — 21 pages

• Bash basics — commands, quoting, pipes, variables, and safe scripts
• bash parse arguments with getopts and $@
• bash arrays — create, iterate, append, slice
• bash check exit code $?
• bash check if file or directory exists
• bash command not found — fix PATH and install
• bash cron job — schedule scripts with crontab
• bash date format — format dates with date command
• bash find files — find by name, type, and size
• bash for loop — iterate over files, arrays, ranges
• bash heredoc — multiline strings and stdin redirection
• bash kill process by port number
• bash no such file or directory — fix paths
• bash permission denied — chmod and file permissions
• bash pipe fail — pipefail and PIPESTATUS
• bash read file line by line
• bash redirect stderr — 2>&1 and separate streams
• bash set -e — exit script on error
• bash string comparison — test operators and [[ ]]
• bash syntax error near unexpected token
• bash xargs — build and execute commands from stdin

regex — 16 pages

• Regex basics — patterns, groups, quantifiers, boundaries, and safe matching
• regex alternation — match one of multiple patterns
• regex anchors — ^ $ \b start, end, word boundary
• regex character classes — \d \w \s and ranges
• regex match date — YYYY-MM-DD and common formats
• regex match email address
• regex global replace — replace all matches
• regex match IP address — IPv4 validation
• regex lookahead and lookbehind — zero-width assertions
• regex multiline flag — ^ $ match line boundaries
• regex named capture groups — (?<name>...)
• regex non-greedy match — use *? and +? instead of * and +
• regex match phone number — international and US formats
• regex replace with capture group reference
• regex match URL — http, https, and optional path
• regex word boundary \b — match whole words only

npm — 17 pages

• npm basics — package.json, dependencies, scripts, and reproducible installs
• npm audit fix — resolve security vulnerabilities
• npm engines field — require specific Node.js version
• npm ENOENT no such file or directory
• npm ERESOLVE unable to resolve dependency tree
• eslint version conflict with TypeScript — how to fix
• npm link — use a local package without publishing
• package-lock.json conflict — how to resolve
• npm ERR! missing script — how to fix
• npm peer dependency warning — how to handle
• npm Cannot find module — how to fix
• npm node-gyp build failed — how to fix
• npm cache clean and verify — fix corrupted installs
• npm outdated — check for package updates
• npm private registry — configure .npmrc
• npm scripts — define and run custom commands
• @scope/package-name — install and use scoped packages