These words are links to other parts of the page or site and will help you navigate. This is your profession. Remember that future employers may be reading your posts and visiting your web pages. Anything in writing is permanent. Your email messages may be saved and later forwarded to somebody for whom you did not intend them.
Many people pay by the minute for their access time.
Don't waste download time by coping entire messages in your replies - only copy what is necessary to make your point clear. Don't send jokes and virus warnings that most people have already seen 20 times. Humor is subjective. Imagine that the list is a teacher's lounge - and listening to you are all different types of people from the teaching profession. When you join a new list, don't post right away.