Techniques of sales promotions can include free samples, free offers, and merchandising.

• Free samples are a popular sales promotion technique, where a company offers a small portion of a product for free in order to generate interest and encourage trial.
• Free offers are similar to free samples, but they typically involve a purchase requirement. For example, a company may offer a free product with the purchase of another product.
• Merchandising involves the display and promotion of products in retail environments in order to increase visibility and generate interest.

All three of these sales promotion techniques are commonly used by companies to boost sales and increase customer loyalty. The specific technique used will depend on the product, target market, and marketing goals.