Learn Crypto

Structured education across every format and skill level · 23 guides

Topic:All Basics Trading DeFi Security Web3

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"Transaction Is Expected to Fail" — What That Error Message Means

What "this transaction is expected to fail" means in MetaMask: your wallet rehearsed the transaction, it was rejected, and here is how to fix it.

How to Fix "Swap Failed" on Uniswap

How to fix a swap failed error on Uniswap: the checks in order, from slippage and gas to approvals and tokens that cannot be sold.

Why Did My Transaction Fail?

Why a crypto transaction fails: reverted, out of gas or stuck pending. How to read the block explorer and why the fee is still charged.

Why Did My Swap Fail?

Why a crypto swap fails: slippage, gas, approvals and liquidity explained simply, plus what happens to your tokens and your fee.

What Is Impermanent Loss in DeFi?

Impermanent loss explained in plain English: why putting two tokens into a Uniswap pool can leave you with less than simply holding them.

What Is Yield Farming in DeFi?

Yield farming explained in plain English: how people earn rewards by lending or pooling crypto in DeFi apps, where the yield comes from, and what can go wrong.

What Is TVL in Crypto? Total Value Locked Explained

TVL explained in plain English: what total value locked measures, why apps like Aave and Uniswap are ranked by it, and what the number quietly hides.

What Is a Flash Loan in DeFi?

Flash loans explained in plain English: how DeFi lets you borrow millions with no collateral, why it is repaid in seconds, and what it is really used for.

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