This is a piece of advice that implies that it is important to separate personal relationships from professional ones. In other words, it's important to maintain friendships with people who you have a good personal relationship with, but when it comes to work and getting stuff done, it's best to work with people who have the skills and competence to achieve your goals.

Keeping your friends for friendships means that you should maintain your relationships with people that you enjoy spending time with, share common interests with, and have a strong emotional bond with. These are people who you can rely on for emotional support and who you know will be there for you through thick and thin.

However, when it comes to work, it's important to recognize that not all of your friends may have the skills or experience necessary to help you achieve your goals. This is where working with skilled and competent people comes in. These are people who have the expertise, experience, and knowledge necessary to help you achieve your work-related goals.

By keeping these two realms separate, you can ensure that you will be able to maintain your friendships and also achieve your professional goals. By working with skilled and competent people, you can increase your chances of success and achieve your goals more quickly and efficiently.