I. Introduction. The Obligation. The Rendering. Complex Obligational Relationship. The role of Obligation. Obligations and rights in rem. Systematic principles of Contracts Law. The principle of private autonomy; the principle of good faith, the principle of non‐unjust enrichment. II. Sources of obligations. Contracts. Unilateral acts. 'Negotiorium Gestio'. Unjust enrichment. Civil liability. Contractual responsibility. Extracontractual responsibility: torts, risk activities liability and responsibility for lawful acts. III. Kind of obligations. About the lien: natural and civil obligations. About the parties: conjunctive obligations and joint and several obligations. About the object. IV. Transmission of Obligations. Credit and Debits transmission. Credits assignment. Subrogation. Single transmission of debts. Assignment of contractual position. V. General Security of Obligations. Means for the maintenance of Patrimonial Security. Nullity declaration. Creditor subrogation over the debtor. ''Pauliana'' Opposition. Attachment. VI. Special Security of Obligations. Personal and Real securities. Bonds. Guaranty. VII. Fulfillment and Unfulfilment of Obligations. 7.1. Fulfilment. 7.2. Unfulfilment. Impossibility of fulfilment and default not concerning to the debtor. Unfulfilment and default attributable to the debtor. 7.3. Defective fulfilment. 7.4. Contractual set of creditor rights. 7.5. Coercive means for realization of rendering. 7.6. Property assignment. 7.7. Creditor default. VIII. Causes of extinguishment of Obligations besides fulfilment. IX. Contracts. Typical and No typical contracts. Mixed contracts and contracts in coalition Enumeration and concise characterization of typical contracts ruled by Civil Code. Game and Bet.

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