With this post, we take the opportunity to share you the most recent guidelines from EU national authorities. We'll try to update this consent cheatsheet if things change.
2020 Guidelines on the "Processing of personal data of website visitors" | 2019 Executive Order ("EO") regarding cookies (still applies unless the above 2020 document states differently)
*guidelines apply to any consent-based processing of personal data, not only to cookies or trackers, strictly speaking.
European Data Protection Board - EDPB
2020 EDPB Guidelines 05/2020 on consent under Regulation 2016/679 (English)