Please try taking the time to do a quick forum search before asking questions. Many of the ones you are asking (over multiple threads) have already been asked and answered numerous times.
For instance, typing “brake type coast” into the search bar I find these 2 posts within the top 10 listed, both of which give a description of all the brake types:
Also, please refer to the Vex Forum Rules regarding using the forums as real-time chat:
If you find that you are going back and forth continually in a short time period with a few people on threads, you should move the conversation to DM (this is especially true if you are asking questions unrelated to the original post topic). Better yet, before doing so take 5-10 minutes to do some online research into the questions you have. You will often find the topic has been discussed many times, and doing the research yourself will give you a much better understanding of how to make your robot.