PhD representation councils and organisations provide useful information on the PhD track and other PhD-related matters.
PRomovendi Overleg Utrecht (Prout) represents the interests of all PhD candidates from Utrecht University. They are an association formed by volunteer PhD candidates from all graduate schools within the university. They also provide information on many topics, e.g. taxes for PhD candidates, and a PhD guide with information on, for example, the rights and regulations for PhD candidates (simplified version), finances, and finishing your PhD.
Promovendi Netwerk Nederland (PNN) is the national association of PhD candidates from all Dutch universities, and represents the interests of PhD candidates on a national level. Their website provides information on many PhD related topics. They furthermore organise the National PhD Day.