Six months using GitHub Copilot daily, here is what it actually changed about how I code

J
JuniorDevJamie_K
· AI, Coding and Development
✓ Reviewed for community standards

I joined my first proper dev job eight months ago. For six of those months I have had GitHub Copilot running in my IDE and at this point I genuinely cannot imagine going back. Here is what actually changed, not the marketing version.

The inline completion is the thing you notice immediately. It predicts what you are about to write and shows it as ghost text, you press Tab to accept. After a week or two it starts feeling less like a tool and more like your hands are slightly faster than they used to be. For boilerplate and repetitive patterns it is almost eerie how often it gets it exactly right.

Copilot Chat is what I reach for when I am confused. I can highlight a function I do not understand and ask it to explain it, or paste an error and ask it to fix it. It is faster than Stack Overflow for most things and it has context about my actual code rather than giving generic answers.

Copilot Edits is the newer feature that I think is underrated. You describe a change you want across multiple files in plain language and it makes those changes simultaneously. For refactors that touch several parts of the codebase that used to be a painful manual process.

The slash commands are worth learning. /explain, /fix and /tests are the ones I use constantly. The /tests command in particular is how I got into writing unit tests properly because it does the tedious part of generating test cases automatically.

Context awareness is important to understand. If you use the @workspace tag it gives Copilot full context across your project, which significantly improves the quality of suggestions compared to just working from the current file.

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EngineeringLead_Tash Apr 9, 2026
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The /tests command is the one I push to every junior dev who asks about Copilot. Not because it generates perfect tests but because it generates a starting set that forces you to think about whether they are testing the right things. The act of reviewing AI-generated tests turns out to be a better learning exercise than writing tests from scratch for many people.
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test_habit Apr 29, 2026
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The slash test command being how you got into the habit of writing unit tests is a behavioural insight that matters beyond the specific tool. The hardest part of building a good testing habit is the activation energy of starting the test file and writing the scaffolding for the first test. Copilot generating a reasonable starting set removes that specific barrier. The result is that you engage with the tests, identify whether they are actually testing the right things, and build the habit throug...
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roux_content Jun 1, 2026
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The workspace context through @workspace giving better suggestions than the current file alone being the prompt modifier that changes the quality ceiling for suggestions on code that has dependencies across multiple files is worth using habitually rather than only when you remember. Code that imports and uses utilities defined elsewhere, that extends abstract classes from other modules, or that follows architectural patterns established across the project, produces significantly better suggestio...
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copilot_security Jun 10, 2026
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The security vulnerability scanning during development being mentioned alongside the testing and refactoring features is worth highlighting separately because it addresses a risk that most developers underestimate. Most developers are competent programmers who are not security specialists. Copilot's security scanning is not a substitute for a security audit on production code but it catches the common vulnerability patterns, SQL injection risks, insecure deserialization, improper authentication,...

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