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Open source licences define how code may be used, modified, and redistributed. Permissive licences such as MIT impose relatively few conditions, while copyleft licences such as the GPL require derivative works to be released under the same terms, so teams need to check compatibility before adopting a dependency.

Crypto wallets fall into two broad categories: custodial and non-custodial. A custodial wallet is operated by a service that holds the private keys on the user's behalf, which is convenient but requires trusting that operator. A non-custodial wallet returns control of the keys to the user, which removes counterparty risk but also means that a lost recovery phrase cannot be restored by anyone.

The first step in web performance work is identifying the bottleneck. Browser developer tools expose the timing, size, and blocking behaviour of every request, which makes it possible to target compression, caching, or deferred loading of non-critical scripts instead of guessing.

On-chain transaction fees depend largely on congestion. When many transactions are competing for limited block space, validators prioritize the ones offering higher fees, so the cost of inclusion can rise sharply during busy periods. Batching transfers, using layer-two networks, or simply waiting for quieter hours are common ways to keep costs down.