What makes an algebraic expression different from an equation?
Learn to spot the equals sign, distinguish expressions from equations, and classify examples with a quick practice set.
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When should an API request use GET rather than POST?
Choose GET to retrieve data and POST to send data for processing. Check the API documentation for each endpoint’s method and expected behavior.
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How can I prevent keyboard users from getting trapped in a website component?
Test each component’s keyboard entry, operation, boundary behavior, and exit using its intended widget pattern.
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How does the Accept header differ from Content-Type?
Learn which header describes the body you send, which expresses the response format you can handle, and how to spot a mismatch.
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How can I give an icon-only button an accessible name?
Learn how to name icon-only buttons, keep names aligned with visible labels, and check the name exposed in the accessibility tree.
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What is the difference between HTTP status codes 200, 201, and 204?
Compare these success codes by what happened to the resource and whether the response includes content.
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How can I make a responsive layout work at high zoom?
Use a repeatable high-zoom test to find clipped text, overlapping controls, and unnecessary horizontal scrolling across representative pages.
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How can I keep keyboard focus inside a modal dialog while it is open?
Plan where focus goes when a modal opens, keep keyboard navigation inside it, and return focus sensibly when it closes.
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How can I check whether my page’s tab order follows its visual structure?
Compare keyboard focus with the page’s meaningful sequence, spot confusing jumps, and choose a robust fix without assuming visual order must always be identical.
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How can I build a show-and-hide disclosure button that stays in sync?
Build a disclosure whose button state matches what readers can actually see, and use a checklist to test updates and keyboard operation.
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How can I make keyboard focus visible on controls with different backgrounds?
Use a component-by-component test matrix to check focus against each control state and background, and spot where one indicator color blends in.
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How do Git ignore rules differ from files already tracked by Git?
Understand why .gitignore does not hide a tracked file, then stop tracking it while keeping your local copy.
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When should I use Git revert instead of moving a branch backward?
Compare how `git revert` and reset affect commit history, the branch tip, and local files before choosing how to undo a change.
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How do Git restore options differ for staged and unstaged changes?
Learn which Git restore option changes the index or working tree, how to inspect the exact changes first, and what each command may discard.
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How can I verify a Git conflict resolution before completing a merge?
Use a focused review sequence to check the edited file, confirm Git no longer reports unmerged paths, and inspect exactly what is staged.
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How do I read Git conflict markers when two branches change the same lines?
Learn what each Git conflict marker means, compare the competing edits, and review a resolved example before staging the file.
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How can I create and switch to a local Git branch without losing work?
Check your working tree first, then create and switch to a branch safely—with clear options for edits that are not ready to commit.
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How can I explore Git commands safely in a disposable local repository?
Create a throwaway Git repository, practice staging and committing sample changes, and inspect each result without involving a real project or hosted service.
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How can I read Git history as a graph of branches and merges?
Use a compact Git log graph to follow local commit ancestry, identify branch labels, and see where a merge joins lines of history.
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How can I unstage a file without discarding its edits?
Unstage a file while keeping its working-copy edits, then check that it appears as a modified, unstaged change.
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How can I use EXPLAIN QUERY PLAN to inspect a SQLite index choice?
Compare SQLite’s query plans before and after an index, learn what SCAN and SEARCH suggest, and avoid treating plan output as a guarantee.
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How can I test SQLite constraints without risking real data?
Create a disposable SQLite teaching fixture, test expected successes and failures, and use a cleanup checklist that keeps practice separate from real data.
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How can I tell staged changes from unstaged changes in Git?
Compare Git’s staged and unstaged diff views to see what is prepared for your next commit and what remains outside it.
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What is the difference between Git’s working tree, staging area, and commits?
Understand where Git changes live, how to inspect each layer, and what will be included in your next commit.
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