Learn by doing

Practical guides.

Step-by-step articles with working examples, honest limitations, and a useful result at the end.

A practical JSON syntax check with examples of common parser errors and a safe workflow.

Convert a spreadsheet-style CSV export while preserving leading zeros and other identifier strings.

Reduce a JPG, PNG, or WebP toward a 100 KB, 200 KB, or 500 KB upload limit locally, then check dimensions and image quality.

Choose a strong random password locally, understand length and character groups, and store it safely.

Create a simple color harmony and use contrast ratios as an accessibility check during interface design.

Review additions and removals in two plain-text versions, understand line-based diff limits, and reduce comparison noise.

Check an English caption, application, or article against a limit and understand how whitespace and Unicode affect counts.

Use a local Markdown preview to inspect headings, lists, links, quotes, emphasis, and code blocks before sharing.

Create a static Wi-Fi QR code locally, choose the right security type, scan-test it, and export a print-ready SVG or PNG.

Re-encode a JPG, PNG, or WebP in your browser to remove common embedded photo metadata, then check the result and understand its limits.