Git Bisect: Find the Commit That Introduced a Bug
Find the commit that introduced a regression with Git bisect. Follow a tested Python example, automate the search, and learn when a test error can produce the wrong result.
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API Idempotency: Retry Requests Without Creating Duplicates
A timeout can hide a successful API request. Learn how operation keys, atomic database writes and a clear retry contract prevent duplicate work, with a tested Python and SQLite example.
Python module not found after pip install? Check the interpreter
Pip says the package is installed, but Python cannot import it? Find the interpreter running your code, check its environment and fix the mismatch.
Git detached HEAD: save a commit and recover it with reflog
Detached HEAD is normal. Learn how to keep a commit on a branch, carry uncommitted edits, and find a commit with Git's reflog.
CORS Errors Explained: Fix Preflight, Headers and Credentials
A CORS error is not always an API failure. Learn to inspect preflight requests, configure allowed origins and debug cookies without disabling browser security.
Docker Compose networking: localhost, names and ports
Docker works in your browser but fails in a container? Use a two-service example to choose the right hostname, port and listening address.
Port 3000 is already in use? Find the process on Windows
A dev server says a port is already in use. Use Windows PowerShell to find its current TCP listener, map the process ID to an app and choose a safe next step.
Git Stash: Save Unfinished Work Before Switching Branches
Use Git stash to park unfinished changes, switch branches, and restore the right work without dropping it too early. See how untracked files, conflicts, commits and worktrees change the choice.
Git Worktrees: Keep Two Branches Open in Separate Folders
Use a linked Git worktree to open another branch without disturbing unfinished edits. Check both folders, manage shared resources and remove the checkout safely.
.gitignore not working? Stop tracking a file and keep it locally
Git still tracking a file in .gitignore? Check the rule, keep your local copy and review the removal, with clear advice for teammates and exposed secrets.
How to Resolve a Git Merge Conflict Without Guessing
When a merge pauses, markers show competing versions, not which to keep. Learn to inspect both sides, write the intended result and review before continuing.
Sudo for Windows in 24H2: Choose a Mode That Fits
Windows 11 24H2 adds Sudo for Windows. Check whether it has reached your PC, enable it, and choose a console mode that fits the command.
Windows 11 Sudo Is Still a Preview: How Its Three Modes Work
Microsoft’s Windows Sudo can elevate one command, but in March 2024 it was an Insider preview. See how its three modes differ and which trade-offs matter.
Cross Site Scripting — XSS Injections
XSS aka cross site scripting is a pretty common type of attack which has affect millions and is continuing to affect thousands. The simple…
Networking — OSI Model
The OSI ( Open System Interconnection ) model is actually a pretty overlooked topic in general. The model which is responsible for the…
Securing Apache2 — Ubuntu 18.04
Apache being one of the most popular options for creating a quick and simple web server, let us take you through on how you can secure…
Installing LAMP — Ubuntu 18.04
LAMP aka Linux, Apache, MySQL, and P HP, allows for easy hosting of websites or any apps. We will be using Ubuntu 18.04 to install LAMP…
Virtual Memory & Physical Memory
Well to start off, virtual memory is a huge topic to cover. Pretty sure, I won’t be able to cover everything in one post, so I might make…