This is to help everyone level and build their character properly. I haven't reached a lot of these myself but once you get to the levels to where you can use them, i hope it will assist you in further strengthening your team.
Q&A: This is a link to some questions and answers for new players to better assist you getting started. Link 1 and Link 2.
Basic Controls: Straight forward, no explanation needed.
Character creation: Basic info.
Classes: More basic info.
Instances: This is your normal adventure story line.
Pals: For every so many reputation points to receive you get a chance to unlock new and more powerful pals. For a quick overview of a few starter go here.
Training: This is a feature that allows you to pay either gold or dragon gold to further increase your hero and pals attributes.
Life tree: I have not yet unlocked this feature that will open for us at leveays. But may be a good thing to read up on it so you can breeze through it when you reach that level and be well equipped for it. :)
Impart: This seems like a pretty good feature to transfer your training and potions from a pal you're not using and add to one that you would like to strengthen further.
Advancement: Another great enhancement feature for your character. Opens at level 70 and allows you to increase your adventurer status increasing your overall health every time.
Dragon Lair: This feature is basically a side adventure awarding you with exp and crystals to upgrade your weapons.
Beset: This is a feature that allows you to add crystals to your weapon to further increase it's stats. They can be gained through the dragon's lair feature.
Skill: This feature allows you to increase not only your stats but once the meter is full it will also strengthen your finishing attack making it stronger.
Hand of midas: This feature for myself has only popped up once a day but when it does try to get it. This doesn't increase exp but it will gain you more gold to increase other things.
Dragon Hunter: Haven't gotten this feature myself and still not quite sure how to use it. If anyone has a better explaination on how to use please let me know. Seems like you can rain honor and valor off it for sure though.
Potion: The potions are here to increase your stats. For each level after you place one potion each one decreases the amount added but still very important to work on.
Medals: These are used to buy your potions.
Talent: This system is another great way to increase your different types of attack, defenses and health using your honor points.
Equipment: Increasing your equipment will further your advancement in your defenses and other stats.
Meditation: This is a great way to level up quick. Once the meter is full it will grant you an excessive amount of exp and you can quicken to increase it and collect instantly.
Astrology: One of the keys to greatly increasing your stats. Can be kinda complexed at first but is very simple once you get used to it. When you start gaining millions of gold every day i'd start dumping a good bit of your gold into astrology and get a head start on it.