Dailies are consisted of common dailies, league dailies and couple dailies. Each daily quest can only be done once with the rewords of item, exp, etc.
Common dailies: can be accepted everyday, finfishing it can gain item, exp, etc.
Guild dailies: only for the ones who have joined a league. Finishing quest can gain exp, gold cions, item, etc.
Couple dailies: Couples only. A couple needs to fight together to complete these quests. It will disappear after divorce.