The majority of the world spends their time talking, which means there are very few listeners. Learning to know when to talk and when to listen is something we do our entire lives, but it is not as easy as it sounds. Being patient enough to let the other person talk, but confident enough to politely interject when they don't stop.
Knowing what you should or shouldn't say and in what setting. Communicating something important to someone before half truths are leaked is a major issue in the corporate world. Communicating outside of your bubble is an issue. This is difficult for many people and many departments and teams. It's just not thought about.
Additionally, it's really important to know what form of communication should be used when.
If you are updating a friend or relative that does not require a response or conversation right away, write a letter (yes people still do that). It really helps to practice those communication and "writing" (not as in using a pen or pencil, rather putting words together in a way that makes sense to the reader) skills.
If you have an urgent question that needs an immediate answer, call the person. This helps you practice the verbal communication skills that are so important. We all have to talk to people or in front of people at some point in our careers. Knowing how to say what you can put on paper and being able to handle unexpected questions and interruptions is important.
If a single topic of conversation takes more than 3 texts or emails, just call.
If you want or need a response, but it is not urgent and might be longer than should be written in a text or instant message (more than a couple short sentences) send an email. Again, practicing those writing skills. If you aren't sure someone checks their email, text or message them to let them know you sent it.
These are things we all struggle with every day regardless of the career we choose. Learning how to deal with these things sooner rather than later will go along way in your career.