I am still too unexperienced to actually write a solid guide, but I would very much like to request a guide about Initiative and Action order.
Why? Simultaneous turns is something very unique to CCGs (actually the first one I've seen yet), and the order in which things happens is extremely confusing (I am not even exaggerating here), especially for new players.
I am quite good at adapting to card games, but I still run into mistakes where I negate my own cards because I didn't know the order it would be played in.
A detailed guide that explains which Card types (preemptive, abilities, locations, characters, etc..) have priority over others and how certain orders are executed after you end turn (placement, deploymentspeed, deployment in conjunction with abilities such as word of command). I believe it to be a lot of work, but it would be a complete enrichment to the list of existing guides, especially for newer players that want to learn to understand the game properly.