Practical Guides on Passwords, Word Counts & Money
Free, practical articles about creating strong passwords, staying safe online, debugging JSON API responses, getting the word count right, understanding currency exchange, saving on international money transfers, planning travel budgets, scheduling meetings across time zones, working out what time your flight actually lands, comparing salaries and job offers, staying properly hydrated, and understanding financial calculators. Written by the Fengvi Editorial Team — every article states its sources, so you can check the numbers yourself.
Note: Blog articles are currently available in English only.
Currency Exchange & Rates
Get fair exchange rates abroad and understand what actually moves the market.
GBP to USD Exchange Rate: The Complete Guide for 2026
I thought the pound-dollar rate was easy until a London pub receipt confused me. Here's what the BoE, the Fed and "cable" actually do to your money.
USD to CNY Exchange Rate: The Complete Guide for 2026
I landed in Shanghai with a wad of cash nobody wanted. The yuan has two versions, a daily fixing and a $50,000 quota — here's how to convert without losing money.
USD to JPY Exchange Rate: The Complete Guide for 2026
I read the dollar-yen rate backwards for a week before my first Tokyo trip. Here's how the carry trade actually works and how to get yen without paying airport prices.
How to Get the Best Currency Exchange Rate in 2026
I once lost 10% of my money at an airport exchange counter. Here's everything I've learned about mid-market rates, hidden fees, and getting a fair deal.
USD to EUR Exchange Rate: A Complete Guide for 2026
I watched the dollar-euro rate every day for three months before a trip. Here's what actually moves it — and what doesn't.
AUD to USD Exchange Rate: The Complete Guide for 2026
I spent a working holiday in Melbourne convinced oil drove the Aussie. Then I learned it's iron ore, coal and China — and that the airport kiosk wanted 5% of my money.
EUR to JPY Exchange Rate: The Complete Guide for 2026
I converted euros to yen in Milan and got charged twice — once by the bank, once by the cross rate. Here's how to get yen without paying double.
USD to CAD Exchange Rate: The Complete Guide for 2026
I drove Calgary to Banff doing gas-price math in my head. Why the loonie follows oil — and why it sometimes doesn't, plus the cheapest way to get Canadian dollars.
USD to CHF Exchange Rate: The Complete Guide for 2026
I misread the franc rate on a Zermatt cable car and did bad math for an hour. Why the Swiss franc is so strong, and how to get francs without paying airport prices.
Salary & Work
Compare salaries and job offers on the hourly rate that actually reaches your pocket.
Salary vs. Hourly Pay: Which Is Actually Better for Your Wallet?
A "grown-up" $90k salary on 50-hour weeks paid less per hour than my first retail job. How the two structures really compare, overtime included - plus the freelance version.
How to Compare Two Job Offers: A Total Compensation Checklist
"Did you count the commute?" One question proved Offer A's extra $8,000 was still the worse deal. A compensation checklist that also works for non-US and remote offers.
Health & Wellness
Get your daily water target right with the science, not the bottle-seller slogans.
How Climate Changes Your Water Needs: A Traveler's Guide to Heat, Cold & High Altitude
Two days of Singapore humidity humbled my usual 2.4-liter routine. How tropical, desert, cold, high-altitude and airplane-cabin conditions change your daily target — destination by destination.
Hydration Myths Debunked: 8 Water Beliefs That Are Getting Your Intake Wrong
Mile nine of a half-marathon, my fingers swollen and my head spinning - from too much water. Eight hydration myths, fact-checked after an overhydration scare.
I Ditched the 8-Glass Rule: How Much Water Should You Drink by Weight?
I drank eight glasses a day for six years and felt worse, not better. Your weight is the better starting point - the ml-per-kg formula, an oz-and-liters lookup table, and hot- and cold-weather adjustments.
Money Transfer
Send money internationally without giving away your hard-earned cash in fees.
How to Send Money Abroad Without Paying High Fees
My first bank transfer abroad quietly cost me $85 in hidden fees. Here's how I send money internationally for a fraction of that today.
Travel Budget
Plan a trip budget that survives contact with reality — no more running out of money abroad.
Paying Abroad: Cash, Card, or ATM? What Actually Costs Less
A Bangkok hotel once charged me 4% just for choosing the wrong currency at checkout. Here's the payment system I now use everywhere.
How Much Money Do You Need for a Trip? A Practical Travel Budget Guide
I ran out of money on day 8 of a 10-day trip because my spreadsheet was a fantasy. Here's a travel budget that survives contact with reality.
Travel & Visas
Understand visa day-counting rules so a miscounted stay never becomes a fine.
I Was Wrong About My Schengen Days by a Week. Here's the Right Way to Count.
I told a border officer my Schengen day count with total confidence and it was wrong by a week. How the rolling 90/180 rule actually works — and how to count your days before you fly.
Loans & EMI
Understand how loan payments are calculated so you never overpay again.
Equal EMI vs Reducing Balance: Which Loan Repayment Method Actually Costs Less?
I chose the equal installment plan because the salesman called it the simple option. Then I ran the numbers on total interest — and it wasn't simple at all.
EMI Explained: How Loan Payments Are Calculated
I signed my first car loan without realizing my early payments were almost all interest. This is what I wish the salesman had shown me.
Unit Conversion
Avoid the everyday conversion mistakes that ruin recipes, trips and projects.
Metric vs Imperial: How a Mix-Up Nearly Cost Me a $400 Espresso Machine
I read "35 lbs" as "35 kg" and paid the shipping bill to prove it. The everyday conversions that stop you from making the same mistake.
Common Unit Conversion Mistakes and How to Avoid Them
My cookies came out like hockey pucks and my rental car nearly earned me a ticket. Here are the unit conversion mistakes real people make.
Shopping & Saving
Do the math on discounts and sales before the register does it for you.
Why the Price Tag Says $49.99 but You Pay $54.12: US Sales Tax vs European VAT
My $49.99 headphones cost $54.12 in New York and exactly €49.99 in Berlin. How US sales tax and European VAT really work — and how to compare prices across borders fairly.
Why 30% Off + Extra 20% Is NOT 50% Off (I Paid $72 to Learn This)
A salesman once talked me into a stacked discount and I paid $72 more than I thought I would. Here's the discount math everyone gets wrong.
Tipping & Dining
Tip the local wage, not your home-country habit — without awkwardness or overpaying.
How Much to Tip in 2026: A Guide Born From Two Awkward Dinners
I tipped 8% in Chicago and embarrassed myself in Tokyo. How much to tip at restaurants, hotels and taxis in the US and abroad — and why 18% is the number that saves you.
Security & Passwords
Create passwords that survive real-world attacks — before a breach teaches you the hard way.
I Reused One Password for 10 Years. Here's How to Create a Strong Password That Actually Works
One leaked password from a forgotten store account triggered a $180 credential-stuffing attack. What really makes a password strong, and why a password generator is the only fix that lasts.
Writing & Word Counts
Get word counts, character limits and page estimates right before you hit submit.
How Many Words Is a Page? The Guide I Needed Before My Essay Was Cut Off
My scholarship essay was truncated at 5,000 characters and the ending never got submitted. How many words fit on a page, and why word counts and character counts are not the same thing.
Work & Meetings
Scheduling calls and projects across time zones without the 2 a.m. alarms.
The 2 A.M. Call Was Always Mine: How Global Teams Split the Meeting-Time Tax
Priya joined our team in Sydney and sat through 31 of 34 weekly reviews between 1 a.m. and 4 a.m. Why the meeting-time tax always lands on the people furthest from headquarters — and how to count it, rotate it and shrink it.
Why My Flight Landed Before It Takes Off: Reading Arrival Times Across the Date Line
Thirteen and a half hours in the air, and I landed four hours before I left. How to convert arrival times across the International Date Line — and which date to book your hotel for.
I Dialed Into My Client Meeting an Hour Late. How to Plan Meetings Across Time Zones
I joined my first Sydney client call an hour late because daylight saving had silently changed the time difference. How to schedule meetings across time zones with a meeting planner — without losing sleep or the opening minutes.
Shipping & Ecommerce
Cutting shipping costs with the right box, the right math and the right currency.
My 3-Pound Parcel Was Billed as 50 Pounds: A Volumetric Weight Guide
A feather pillow weighed 3 lb but the courier billed me for 50 because of the box. How dimensional weight works, and how to stop overpaying for big, light parcels.
JSON & APIs
Reading, validating and debugging the JSON that APIs actually send you.
How to Read a Minified JSON API Response (and Find the Error Inside It)
Your API returned 60 KB of JSON on one line. How to make it readable in the browser, how to turn a character offset into a line and column, and the six failure modes that break the parse.
Base64 Is Not Encryption: What It Actually Hides
A shared secret described as "encrypted with Base64" started this one. Here's what encoding really changes, and why a JWT payload was never secret.