有关 (yǒu guān) is used both as a verb ('to be related to, have to do with') and as a preposition ('concerning, about'). As a verb it often pairs with 跟 or 和 (跟...有关). As a preposition it is similar to 关于 (guānyú), but 关于 is only a preposition and is more formal, typically used at the start of a sentence. The verb 关系 (guān xì) means 'to concern, affect' and implies a stronger, direct impact.