give me some legal criteria

1. The individual must be of legal age or have parental consent to enter into a legally binding agreement.

2. The contract must be for a lawful purpose and not violate any laws or public policy.
3. Both parties must have the mental capacity to understand the terms and consequences of the contract.
4. The contract must be clear and unambiguous, with all terms and conditions fully disclosed.
5. Consideration must be exchanged between parties (i.e. payment, goods, or services).
6. The contract must be executed voluntarily and without duress or coercion.
7. Both parties must have the legal authority to enter into the contract (i.e. not prohibited by a legal disability or incapacity).
8. The contract must be properly executed and signed by all parties involved.
9. The contract must comply with any applicable statutory requirements or regulations.
10. Any amendments or modifications to the contract must be agreed upon by all parties and documented in writing.