Conveyancing is the term used to describe the legal work required for completion of a property transaction - usually a sale or a purchase.
A will is a document that states how you want your property dealt with when you die. Once you die, everything you own, and everything you owe, is called your estate.
Legal aid is government funded, free legal advice for people who cannot afford a lawyer when they have to go to court.
A power of attorney is a document that appoints someone to make decisions on your behalf in legal, financial, or personal issues such as health care.