The easiest to do board quests are the escort quests. Usually you just need to go krafa teleport to the other location. Go to the quest handler submit the quest , go back to the board to submit the quest.
Second most probably is the taking picture quest. But depends if you are already used to taking the photo. Sometimes mobs are aggressive and attack you
Third is the killing mobs. Kill x mobs complete board quest quite straight forward.
Fourth is item drop. Avoid doing this. As you don’t know how long you need to kill mobs for the item drop.