1. Do not waste your "Stamina" for sidequest or on getting S-grades on SP's (Singelplayer Dungeon). This is especally helpful in the beginnings of the Game. Getting all SP's on S-grade for the rewards is really a nice thing, yet its also important to get experience and higher lvl equipment for your Lord and Your heroes. Do your Sidequests whenever you have reached the currently last SP that you can enter. That way you have the highest exp/silver/holy stones output. "So why am i not suppused to waste my stamina on S-grades then?!" thats easy, because you can run Dungeons even with 0 Stamina left. You wont be able to enter Tombs/Lairs or getting any items/exp for it, yet you can still improve your grade that way!
2. A common question is "how do i get S-grades on SP's?". there is a common rule for it: Deal high damage with a single blow, take as few damage as possible and also use as few rounds as possible. Should you still not manage to get a S-grade then your still simply too weak. try it again in 1 or 2 lvls and/or with equipment/Astros
3. do NOT use the AFK-function on SP's unless you dont have time! AFK-function is a nice feature that saves up time so most players use it. Yet what most players also dont notice until its too late: AFK does not enter Lairs and Tombs resulting in less exp/silver/holy stones. Eespecially Holy Stones are needed alot early in the game. each SP-run gives for the designed lvl a certain amound of silver/holystones:
20-30: 40 holy stones and 4000 Silver
31-40: 60 holy stones and 6000 Silver
41-50: 80 holy stones and 8000 Silver
and so on.
With the AFK-function you would lose every run the above mentioned silver/holystones!
4. When you are in a guild make sure that you have always 30 contribution unused! This is important for the Guild-Event "Crystal Altar" which is started at lvl 26 from either the Guild Leader or a Vice Leader. Ask one of them when they will hold this event since its not a server-sided event. in this event you will get for 15 minutes, every 15 seconds a certain amound of exp based on your Lord lvl. You can Spend the above mentioned 30 contribution to increase your exp-gain by 50%! Also dont forget to charge the Big Crystal on the map!