Start With What Companies Actually Tell You
Financial statements sound intimidating, but they're really just companies explaining what they did with their money. The balance sheet shows what they own versus what they owe. Income statements? That's basically their report card for the year.
When I'm looking at a Korean company's filings, I usually spend most of my time on cash flow. It's harder to manipulate than earnings. A company might show profit on paper while burning through cash—and that's the stuff you need to notice before everyone else does.
Here's something nobody mentions in textbooks: read the footnotes. The juicy details hide there. Management discussions about risks, pending lawsuits, changes in accounting methods. I found a major red flag once buried in footnote 17 about revenue recognition changes.
The companies that do well long-term usually have consistent operating margins and growing free cash flow. It's not flashy, but it works better than chasing hot stocks.