This covers what a photography contract should generally address — a framework for understanding, not a substitute for a solicitor-drafted document for your jurisdiction.
Even with trusted clients, a written agreement protects both parties by making expectations explicit before disagreement can arise — most disputes come from genuinely different assumptions, not bad faith, and a written agreement prevents that gap forming.
A contract should generally cover: scope (what's delivered, how, by when), payment terms and late-payment handling, cancellation/rescheduling policy, usage rights, model/property releases, liability limitations for circumstances outside your control, and explicit copyright ownership (photographers typically retain copyright while licensing usage).
A client contract governs your business relationship with whoever hired you; a model release separately governs your right to use images of a person (who may not be the paying client) in your portfolio or marketing — conflating the two is a common early-career mistake.
Template contracts found online are a reasonable starting point for understanding structure — but having a solicitor review or draft your actual working contract is worthwhile once you're regularly taking deposits and delivering paid work.