At this time, Video Clears are not available at this time for some of these trials. The Banners will go to the respective wiki page. Video Clears are currently a WIP. Sorry for the Inconvenience.
Trials are your first challenges you will be tackling in the Early Game. Most of them are not hard nowadays due to powercreep but if you are having trouble, Click on the following links to see video clears of each Trial.
Keep in mind that some trials won't unlock until you progress far enough into Quest and have beaten previous Trials if required.
Rewards vary from Zel, Karma, Gems, Spheres, and Collectible Units.
Trial 01-03 has Video Guides, All other links will lead to a text outline provided by the Wikia. Video Guides will come at a later date.