Rewards
The rewards section is where you obtain daily giveaways. They can be simple like gold or special like a bunch of rare hero tokens. What is also important to note is having a VIP level helps since some of the rewards have something added for VIPs in the form of multiplying the reward depending on your VIP level.
Quests
This is where you check the available quests for you to do. Quests are a great way to obtain resources. It is a very good place to earn gold, gems, hammers and experience and also some hero tokens. The daily quests are quests you must certainly do if you want to progress in levels fast.
Events
Like the name suggests, Events are special instances where a limited offer is available. These can come in the form of special maps like the Evo Island where you can have surefire access to some evos for ascension. Some are augmentations to the portals that make them favor a certain hero or even some whole criteria like undead heroes, to come out with an increased chance.
Specials
The specials section is where special bundles are made available for purchase with ONLY real money. In our experience, we haven't seen any special offer here that can be bought with gold or gems. So it is safe to assume that this section will only have special bundles that can only be bought with real money.