This kind of forms are the way on how earning a bitcoin. Though every form has its own different ways and different level of risk. Yet all this kinds give credits.
Each forum use to promote its high level coins and people who use to join those campaigns actually takes part in it and earn money. If you have acknowledgment about trading then its good to trade but if yet you are not trained you can start by joining those campaigns according to me they have scope and makes money for us.