Would someone please advise me if skill training certificates are a requirement for leveling up craft skills? I have levels 15 and 20, but am not sure whether to pursue anything higher. Are they useful to have?
Also, how do I get hold of a Crafting Skill Expansion Ticket? I have levels 34 and 32 for mining and woodcutting, but can't rise above 20 in herbalism, and am unable to collect herbs from the higher levels.