Free financial education
Learn to invest with confidence.
SweatyOpossum is a free learning center for personal finance and investing: plain-English lessons, a searchable glossary, and interactive calculators. Everything here is educational — we sell nothing, recommend nothing, and never give financial advice.
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- No sales pitch
- Sources cited
Five guided learning paths
Twenty-six lessons ordered so each builds on the last — from compound interest to how market segments, styles, and themes like AI fit into one deliberate portfolio. Progress is saved in your browser; no account needed.
Path 1 · Beginner
Foundations
Start here: how compound growth works, saving versus investing, emergency funds, the risk–return trade-off, and why inflation matters.
5 lessons
Path 2 · Beginner
Investing Core
The instruments and mechanics: asset classes, index funds vs. individual stocks, how markets work, contribution strategies, fees, and tax-advantaged accounts.
6 lessons
Path 3 · Intermediate
Portfolio & Diversification
How the pieces fit together: why diversification works, asset allocation, rebalancing, global diversification, and the mistakes that undo portfolios.
5 lessons
Path 4 · Advanced
Advanced Topics
Deeper dives: real estate as an asset class, bond mechanics, behavioral finance, reading financial statements, and a framework for evaluating any investment.
5 lessons
Path 5 · Advanced
Markets & Strategy
Institutional-level equity education: how large-, mid-, and small-cap segments behave, growth versus value styles, emerging markets, fitting real estate and regions into one mix, and a clear-eyed map of the AI and semiconductor trade.
5 lessons
Interactive tools
Calculators and data explorers for testing the concepts from the lessons. Every projection is a hypothetical illustration with labeled, editable assumptions — actual returns vary and may be negative.
Compound Growth Calculator
See how contributions, time, and assumed returns interact — including the cost of a delayed start.
Market Data
Twelve-month price history for two broad-market index ETFs, shown as illustrative benchmarks.
Housing Data Explorer
U.S. median home prices from Federal Reserve data, compared against an editable inflation baseline.
Work-Hours Cost Calculator
Translate any purchase into hours worked at your wage — a budgeting perspective on spending.
Stock Comparison
Compare the historical price paths and volatility of up to five securities, with every metric defined.
How this site works
Educational only
Nothing here is financial, investment, tax, or legal advice — and nothing is a recommendation to buy or sell anything. Lessons explain how things work; decisions remain yours, ideally with a licensed professional. Full disclaimer.
Plain English
Every term is defined on first use and collected in the glossary. Worked numeric examples replace hype in every lesson, and quizzes check understanding.
Sourced and dated
Lessons cite primary sources — SEC, FINRA, CFPB, Federal Reserve data — and every page shows when it was last reviewed. See our editorial standards.