For weapon quests. You get 1 at lvl30 and another lvl100.
For class quests. You get 1 at lvl15 and another at lvl40.
Some of the quest are ridicuously easy and some are painful. A few of them requires you to do a bit of thinking to complete.
The class quests are usually better. You should at the very least do the lvl15 class quest if you're going to use that class a lot. Most likely the rewarded item will be useful until close to the end game. Gold is not that plentiful unless you exploit it.
Boosting Tension if also a good strat to beat bosses. You can 100% in 2 rounds if you combine Egg On with Psyhe Up.
Lastly, get 1 of your char to learn the "Eye for Trouble" skill and scan all enemies. It helps you find items you needed to craft and str/weaknesses of the monster.
