Cardfightlearn is a site that teaches people the rules and basics of the card game Cardfight Vanguard!!.
It goes into detail about the types of clans and even how to play the game under the rules section in the subpage the basics. Special mechanics are also listed under the rules subtopic and talks about the skills of the units. Under the clans subtopic is where the clans of the game are discussed in clan types and deck construction advice is given under clan advice.