When it comes to trading full time or short time, then you are referring to categories of traders and their supposed strategy.

If you mean how to trade long or short term or time, then you need to learn trading from the basics.

In trading, you cannot profit all the time, but you can profit most of the time, depends on how much skill and knowledge + understanding you are able to put use.

A trading competition is usually hosted by a project in conjunction with an exchange, it involves trading a particular token on an exchange to push its volume for a short while, and trade winners are selected on numerous options a stated by the organizers.