Here are some proven, comprehensive, and free courses that provide solid knowledge for trading and investing:

1. Coursera – “Financial Markets” (Yale)

Language: English

What it offers: basics of financial markets, investments, risk management.

Features: taught by Robert Shiller, Nobel Prize winner.

2. Investopedia Academy – free guides

Language: English

What it offers: articles, tutorials, examples of trading, stocks, ETFs, cryptocurrencies.

Features: you can learn at your own pace.

3. Binance Academy (for crypto)

Language: English/Ukrainian

What it offers: cryptocurrencies, blockchain, DeFi, trading, strategies.

Features: completely free, interactive articles, videos.

4. Khan Academy – “Finance & Capital Markets”

Language: English

What it offers: basics of economics, finance, investing, stocks, bonds.

Features: no ads, self-paced learning, simple explanations of complex topics.

5. BabyPips (for Forex)

Language: English

What it offers: basic to advanced Forex trading.

Features: very structured, interactive, includes practical tasks.

Tip:

To get real results, it's best to combine:

Crypto → Binance Academy

Traditional finance → Coursera + Investopedia

Practice → demo accounts and small investments