As a beginner, it's especially essential to get familiar with these four card types: Land: Every time its your turn, you can take one Land card in your hand and place it on the Battlefield
Clues, morph, and goading have all existed as Commander archetypes for a while now, but at least theres a new spin on most of these strategies, and surveil is altogether new territory for a precon
There are plenty of ways to combo with Sidisi, giving you near infinite Zombies, mill effects, you name it
And if you want my opinion on commanders from specific sets, check out my fun ranking series
Second, Contempt is a reactive four-drop instead of some of the great proactive ones like Rekindling Phoenix, Karn, Scion of Urza, or Chandra, Torch of Defiance
You can purchase the Magic Origins Deck Builder's Toolkit on Amazon.com for about $17.