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30 in-depth guides, deep dives, and best practices for the tools and concepts behind them.
30 篇深度指南、深入解析与最佳实践，涵盖工具本身和它们背后的概念。
How to Calculate BMI Accurately
如何准确计算 BMI
Formula, categories, and the limits of the metric.
公式、分类和该指标的局限。
How to Read and Understand Your BMI Result
如何读懂和理解 BMI 结果
Why BMI is for populations, not individuals.
为什么 BMI 适合群体而非个人。
How Calories and Macros Really Work
卡路里与宏量营养素的真相
BMR, TDEE, and the 4-4-9-4 math explained.
BMR、TDEE 与 4-4-9-4 公式详解。
Understanding Loan Amortization
理解贷款摊销
How a fixed payment splits into principal and interest.
固定月供如何拆分到本金与利息。
The Power of Compound Interest
复利的力量
Why your 20s matter and the Rule of 72.
为什么 20 多岁至关重要以及 72 法则。
How to Plan for Retirement in Your 20s
20 多岁如何规划退休
The four numbers you need and where to put them.
四个关键数字以及资金该放哪里。
Renting vs Buying a Home: A Numbers-First Guide
租房还是买房：以数字为先的指南
5% rule, opportunity cost, and break-even math.
5% 法则、机会成本与盈亏平衡。
What Inflation Does to Your Savings
通胀如何侵蚀你的存款
Real returns, TIPS, and the hidden cost of cash.
实际收益、TIPS 与现金的隐藏成本。
When (and When Not) to Use Base64
何时使用（以及不该使用）Base64
Use cases and the "not encryption" myth.
使用场景与"不是加密"的误区。
The History and Future of Character Encoding
字符编码的历史与未来
From ASCII to UTF-8, why one of them won.
从 ASCII 到 UTF-8，为何 UTF-8 胜出。
URL Encoding Explained
URL 编码详解
What the %20 in URLs really means.
URL 里的 %20 到底是什么。
A Gentle Introduction to Regular Expressions
正则表达式入门
Metacharacters, anchors, groups, and practical recipes.
元字符、锚点、分组与实用范例。
Markdown Cheatsheet: The 90% You Will Ever Use
Markdown 速查：90% 场景这就够
Headings, lists, code, tables, and the limits.
标题、列表、代码、表格与边界。
JSON, YAML, TOML — A Quick Comparison
JSON、YAML、TOML 快速对比
When to pick which, and YAML gotchas.
何时选哪个以及 YAML 的坑。
SQL for Beginners: The First 5 Queries
SQL 入门：前 5 个查询
SELECT, JOIN, GROUP BY, and the injection trap.
SELECT、JOIN、GROUP BY 与注入陷阱。
Git for Non-Developers: 10 Commands, 90% Coverage
非程序员的 Git：10 个命令覆盖 90%
The mental model and how to undo safely.
心智模型与安全撤销。
Password Security in 2026: What Actually Works
2026 年密码安全：真正有效的方法
Length beats complexity. Use a manager. Enable 2FA.
长度胜过复杂度。密码管理器。2FA。
How Hash Functions Keep Your Passwords Safe
哈希函数如何保护你的密码
MD5 to SHA-256 to Argon2id, and the work factor.
从 MD5 到 SHA-256 到 Argon2id 以及工作因子。
A Beginner's Guide to Encryption
加密入门
Symmetric, asymmetric, and post-quantum migration.
对称、非对称与后量子迁移。
HTTPS and TLS: What the Padlock Actually Means
HTTPS 和 TLS：地址栏小锁的真正含义
The TLS 1.3 handshake in three paragraphs.
用三段话讲清 TLS 1.3 握手。
Common Web Attacks and How to Defend
常见 Web 攻击与防御
XSS, CSRF, SQL injection, and the OWASP Top 10.
XSS、CSRF、SQL 注入与 OWASP Top 10。
Understanding UUIDs: What Those Hex Strings Mean
理解 UUID：那些十六进制字符串的含义
v1 to v7, sortable IDs, and the collision math.
v1 到 v7、可排序 ID 与冲突数学。
QR Codes: How They Work and How to Use Them Safely
二维码原理与安全使用
Finder patterns, error correction, and quishing.
定位图案、纠错等级与"二维码钓鱼"。
Unix Timestamps Explained
Unix 时间戳详解
The epoch, the 2038 problem, and leap seconds.
时间纪元、2038 问题和闰秒。
Understanding Units: Metric, Imperial, and the Trouble
单位详解：公制、英制和麻烦
Why aviation still uses feet and the Mars Orbiter.
为什么航空还用英尺以及火星探测器的事故。
Color Theory for Web Designers
网页设计师的色彩理论
Hue, saturation, contrast, and accessible palettes.
色相、饱和度、对比度与无障碍配色。
Typography for the Web: The First 6 Decisions
网页字体排印：前 6 个决定
Typeface, scale, line-height, length, color, spacing.
字体、字号、行高、行长、颜色、间距。
The Art of Whitespace in Web Design
留白的艺术
Gestalt principles and the 8-pt grid.
格式塔原则与 8pt 网格。
Animation and Motion: When Less Is More
动画与动效：少即是多
Easing, duration, prefers-reduced-motion, and GPU.
缓动、时长、减弱动效偏好与 GPU。
Web Accessibility: The Easy 80%
网页无障碍：容易做到的 80%
Semantic HTML, alt text, contrast, keyboard, labels.
语义 HTML、替代文本、对比度、键盘、标签。