Read your Quest Journal- Now we hate to snipe here, people, but the "L" key on your keyboard opens up your Quest Journal. This handy-dandy little item contains literally all the information you need to solve whatever quest your given.
Every Trade Skill has a Complement- For example you decide to train Herbalism. An excellent combo with that would be Alchemy. Just by combining one Gathering Profession and one Crafting Profession, you can save yourself a lot of time and Gold.
-You can Eat and Drink at the Same time.
-If you don’t have enough room in your inventory for rewards given from completing a quest, you will not be able to complete that quest. Make sure that you have enough room to accept all the possible items given as reward for a quest before you go to complete it.
-Mobs with yellow exclamation points over their heads indicate they have a quest to give you, while mobs with a silver exclamation point indicates that they have a quest but you are not yet ready to undertake it. Mobs with a question mark over their heads indicate you have a quest to complete by talking to them.
-NPC’s are not the only things that give out quests. Be sure to check out wanted posters, items and terrain features as they all have the possibility of giving out quests to you.
-In your quest log your quests will be colored according to their difficulty (gray being pathetically easy and red being extremely hard).
-If your reputation is high enough towards specific factions you will get lowered prices when purchasing from that area.
-Fishing, Cooking, First Aid, and Archeology do not count towards your two maximum professions as they are considered secondary professions.