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Accessibility work focuses on making a site parse correctly for assistive technology such as screen readers. Writing descriptive alternative text for images, maintaining sufficient contrast, and using a semantic heading hierarchy are among the most common improvements.

Technical debt describes the shortcuts and compromises made to ship quickly, which then raise maintenance costs in later iterations. Regular refactoring and a healthy layer of automated tests are the usual ways to keep that debt from compounding.

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.

Double spending is one of the central problems in digital currency design. Without a central clearing authority, the network must find a way to ensure that the same funds cannot be spent twice, which is achieved through consensus rules, timestamps, and the public broadcast of every valid transaction to all participating nodes.

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.