The Art of Mine Warfare.
To survive in these mines, you must be quick, nimble, and unseen, like an arrow in the night. The steel of a sword shall become your best friend.. In war, the way is to avoid what is strong and attack what is weak. Never go after the strongest enemies, start at the bottom, and move your up. From gnomes to trolls, not the other way around. You will be wiser every encounter, and get stronger. He who wishes to fight must first be able to pay the cost. Make sure you plan every attack, for it could be your last if not wise enough. Think, "Can I take this enemy?" "Will I damage my armour?" "Where is the nearest merchant?" PLAN AHEAD. Force your enemy to reveal themselves, and you shall fight with ease. Outlast him. Outsmart him. Outwit him. The supreme art of war is to subdue the enemy without fighting, after all. All warfare is based on deception. Carry around a dagger and nothing else, and keep your best weapon concealed, for when you are spotted, your enemy will think you weak, and you will have already won. My last word of wisdom for you is even in the midst of chaos, there is opportunity. Do not forget what you came to the mines for, friend. You can set up shop, make coin, start a life again. Exploring can be a hobby, but you must try to live an excellent life again, as that is the greatest victory.
Good luck out there.