The chains people talk about most
Bitcoin BTC
The original network and the benchmark for security and decentralisation. Built to be sound, scarce digital money rather than a general-purpose computer.
Best understood on its own — read the full Bitcoin guide. Trade-offs: limited programmability, slower and costlier when busy, high energy use.
Ethereum ETH
The chain that introduced general-purpose smart contracts. If Bitcoin is digital money, Ethereum is a global, programmable computer that most of DeFi, NFTs and stablecoins run on.
Strengths: unmatched developer ecosystem and security among smart-contract chains. Trade-offs: base-layer fees can spike, which is why most activity is moving to Layer-2 networks built on top.
Solana SOL
Designed for speed. Solana processes very high transaction volumes with very low fees by running a single fast chain rather than layers.
Strengths: fast, cheap, good for high-volume apps and payments. Trade-offs: higher hardware requirements for validators (a decentralisation debate) and a history of network outages it has worked to reduce.
BNB Chain BNB
An EVM-compatible chain closely tied to the Binance ecosystem, popular for low fees and a large catalogue of apps and tokens.
Strengths: cheap, fast and familiar to Ethereum developers. Trade-offs: more concentrated set of validators, so it leans toward performance over maximal decentralisation.
TRON TRX
A high-throughput chain that has become one of the main highways for stablecoin transfers, especially USDT, thanks to low, predictable fees.
Strengths: cheap and reliable for moving stablecoins at scale. Trade-offs: a small, elected validator set means more centralisation than networks like Bitcoin or Ethereum.