Posts

Two forces, one number Your assets grow from exactly two sources: money you add and returns on money already there. Early on, the first dominates. Later, the second takes over — and that crossover is where most long-term wealth actually comes from. Simple interest grows linearly: 100 at 7% earns 7 every year, forever. Compounding grows geometrically, because each year’s return is calculated on a bigger base. That single difference is the whole story. ...

The question everyone asks Most calculators tell you what you will have. The question people actually ask is the other direction: “I want to reach a number by a date — how much do I need to put aside each month?” That is a solvable equation, and the answer is often more encouraging than people expect, because the growth does part of the work. Try it yourself in the savings goal calculator while reading. ...

The number that surprises everyone Borrow 1,000,000 at 4.5% over 30 years. The monthly payment is 5,066.85. Multiply it out and you pay back 1,824,067 — of which 824,067 is interest, about 82% of the amount you borrowed. Now the part that really catches people: in the first five years you hand over 304,011, but only 88,421 of it reduces the loan. The other 215,590 is interest. Five years of payments, and the balance has barely moved. ...

The honest answer up front If you have fewer than a hundred bookmarks and use one browser, the built-in bookmark bar is fine. You do not need a tool. The moment any of these becomes true, a dedicated manager starts paying for itself: You use more than one browser, or more than one computer plus a phone You cannot find a saved link in under 15 seconds Your folders have become a dumping ground You want your collection to survive a browser profile reset What browser bookmarks do well The built-in managers are genuinely good at a few things: ...

Two encodings, two different jobs Both Base64 and URL encoding replace “unsafe” characters with safe ones. That surface similarity is why they get mixed up — and why people sometimes apply both when one would do, or apply the wrong one entirely. The short version: Base64 makes binary data survive a text-only channel. Percent-encoding makes text survive a URL. What each one actually does Base64 rewrites bytes using a 64-character alphabet (A–Z a–z 0–9 + /, plus = padding). Every 3 bytes become 4 characters, so output grows by about 33%. ...

Why bookmark backups matter more than you think Bookmarks look permanent until they are not: a profile reset, a reinstall, a sync conflict, a hijacked account, or a laptop that simply stops booting. Unlike documents, most people never back them up — yet a well-kept bookmark collection often represents years of curation. The good news: every major browser can export and import bookmarks in seconds. The better news: there is a routine that makes this almost maintenance-free. ...

Why your bookmarks stopped working Almost everyone hits the same wall at roughly the same point: you have a few hundred bookmarks, and the folder structure you built two years ago no longer matches how you actually browse. Saving a page takes one second; finding it again takes two minutes. The problem is rarely “not enough folders”. It is that the system was never designed — it just accumulated. Below are seven systems that hold up over time, ordered from simplest to most powerful. ...

The number that means nothing at a glance 1735689600 is a perfectly valid date. So is 1735689600000. They are a second apart in meaning and a thousand times apart in magnitude, and telling them apart by eye is the first thing that trips people up. Both are Unix timestamps: the count of time since 1970-01-01T00:00:00Z, known as the epoch. Databases store them, APIs return them, logs are full of them — and humans cannot read them. ...

Why unreadable JSON is a daily problem Every API response, config file and log line is JSON. Minified, it is a single wall of characters; pretty-printed, the same data becomes something you can scan in two seconds. The data is identical — only the whitespace differs — which is why “formatting” is one of the most common developer searches on the web. This guide covers what formatting actually does, how validation works, and the handful of errors responsible for almost every “invalid JSON” message you will see. ...

The broken link problem You build a search URL and it works fine in English, then breaks the moment a user types anything interesting: https://example.com/search?q=书签管理 & page=2 The server sees q=书签管理 and a stray parameter called page. The & that was supposed to be part of the query value has been read as a separator. The same thing happens with #, =, ?, + and spaces. The fix is percent-encoding (URL encoding): replace unsafe characters with % followed by two hexadecimal digits representing the UTF-8 byte. ...