The questions are; are you being accused of have poor communication skills by your boss?<p>Or are you just trying to improve your skill set?<p>If the just trying to improve look up effective communication, including topic like pathos, logos, and ethos, reading your audience, and non-verbal communication. You could also look at groups like toastmasters.<p>If you are being accused of poor communication by your employer or direct supervisor it’s time to look for a new job. As that this accusation is from certain management playbook techniques as was to deny employees promotions as it threatens the managers own career trajectory. As that you have done something intentional or not that makes them look bad or they need an excuse to justify a poor performance review.