The best certification for Duc would depend on his career goals and interests. If he wants to focus on Java development and Spring framework, the Spring Professional certification would be the most relevant and beneficial for him. If he is interested in general IT and computer hardware, the CompTIA A+ certification would be a good option. If he wants to specialize in information security, the Certified Information Systems Security Professional (CISSP) certification would be a valuable choice. And if he wants to focus on networking, the CompTIA Network+ certification would be a good fit. Ultimately, it is up to Duc to decide which certification aligns best with his career aspirations.
