Woo Joong
Why Interest Rates Move Markets: A Beginner’s Guide to the Fed
When the Fed moves interest rates, stocks and bonds move too. This plain-English guide explains the four channels…
What Moves Currency Prices? Interest Rates, Inflation, and Central Banks
What actually moves currency prices, explained plainly: interest-rate differentials and the carry trade, inflation and purchasing power, central-bank…
What Makes a Trading System Robust? A Checklist
A robust trading system is one whose edge survives conditions it was never tuned on. Here is the…
What Is a P/E Ratio and How Do You Actually Use It?
A plain-English guide to the P/E ratio — what price-to-earnings actually measures, trailing vs forward, why a high…
What Is Overfitting in Backtesting (And How to Avoid It)
Overfitting is why a beautiful backtest and a losing strategy are so often the same thing. What overfitting…
What Is Inflation, Really? A Plain-English Breakdown
Inflation isn’t just ‘stuff is expensive right now.’ This plain-English guide explains what inflation really is, how CPI…
What Is APR vs APY? The Difference That Costs You Thousands
APR is what you pay to borrow; APY is what you earn to save — and the crucial…
What Are Fractional Shares? How to Invest When You Can’t Afford a Full Share
A fractional share lets you buy part of a share by the dollar — so $10 can buy…
Walk-Forward Analysis: Testing a Strategy Like a Quant
Walk-forward analysis re-optimizes a strategy on a rolling window and tests it once on the next unseen slice,…
VTI vs VOO: Which Benchmark ETF Should You Hold for Life?
VTI vs VOO: they share the same issuer, the same 0.03% fee, and about 82% of the same…