Hey there!
We'll start with writing, speaking, and listening in a professional manner.
These are important because:
For writing, it's imperitive. You need to be professional when you're writing to someone because anything you put in writing can and most likely will be used against you. That includes emails and text messages because one wrong mistake can cost you a job.
Speaking is important as well. If you speak and avoid words like "uh, like, and what", it shows whoever you're talking to that you're professional, and you likely know what you're doing. Using these unnecessary vocabulary words portrays you as someone that does not use correct words and doesn't give a good impression.
Listening is perhaps more important than speaking. Often, you may hear the phrase "talk less, listen more". It makes sense because you gain more information from listening to those who possibly know better than you, than continuing to talk and not gaining any knowledge.
Communication is very important because you need to get your message across very clearly and concisely. The way to do that is to practice communication skills, and the more concise you can get your message, the better. Whenever communicating with a co-worker, remmeber to always stay:
C - Cool
C- Calm
C- Collected
Always keep these triple C's of communication and behavior in mind.
Hope this helps!