One basic and fundamental skill in business is communication.
This might seem simple, but quite often it can be overlooked. What I find helpful is learning how to effectively communicate with each and every person you interact with. We are all unique individuals and may require different types of communication.
Effective communication in business can help to build positive working relationships, which in turn can help improve efficiency and morale. Along with communicating effectively, communicating with kindness is also very important. Being kind to your employees and coworkers can help improve everyones mood. With a a more positive mood comes more productivity.