The reason why we talk so much about the WP29 is because it has done a lot of work in publishing GDPR guidelines on myriad topics, although it has far more tasks. These guidelines are in first instance meant to ensure a good implementation and enforcement of the GDPR by the regulatory authorities or DPAs.
European Data Protection Board and national supervisory authorities, cooperation and consistency mechanism

What you need to know about the tasks/ roles/ composition/ management binding decision making/ opinions and guidelines of the EDPB.
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What you need to know about the tasks, roles, composition, management, binding decision making, opinions and guidelines of the EDPB.
The Article 29 Working Party (WP29) and its role in the GDPR/ ePrivacy Regulation and own transformation
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The Article 29 Working Party (WP29) and its role in the GDPR, ePrivacy Regulation and own transformation