Types of contracts in law

What are the 3 types of contracts?
To be legally enforceable, an agreement must contain all of the following criteria: An offer and acceptance; Certainty of terms; Consideration; An intention to create legal relations; Capacity of the parties; and, Legality of purpose..
What are the 5 contract law?
Contract Law 101
A contract is an agreement between two parties that creates an obligation to perform (or not perform) a particular duty.
A legally enforceable contract requires the following elements, all of which are discussed in more detail below.
An Offer (I'll mow your lawn this Saturday if you pay me $40).
What are the 5 contract law?
Contracts may be classified according to their legal effects as (i) valid contract (ii) void contract (iii) voidable contract (iv) unenforceable contract (V) illegal contract..

What are the 3 types of contracts?