Almost every land law problem turns on the same underlying question: when one person holds a right over another's land, does that right survive a sale? This chapter begins with the classification of interests under section 1 of the Law of Property Act 1925, the categories of equitable interest, and the formalities needed to create them — deeds, short leases under s 54(2) and contracts under s 2 LP(MP)A 1989. It then moves to trusts of land, the writing requirements of s 53, and the registration steps needed for dispositions of registered title to take effect at law. Finally it works through priority: the doctrine of notice and land charges in unregistered land, the s 28 and s 29 rules and protective entries in registered land, overriding interests under Schedule 3, and the way overreaching and proprietary estoppel can transform the position of those holding equitable rights.