These six infographics describe six key aspects in the development of citizen science projects. The six key ideas are: co-creation, communities, tools and methods, data, ethics and inclusion, and action. Each infographics condensates several ideas and messages in three columns: why is the aspect is important, how can this aspect be further develop and finally a set of practical recommendations. The digital material is also available at the Universitat de Barcelona website on citizen science. The material is being used in certified training activities on citizen science and developed by the OpenSystems research group. The first use of this material is being done during a certified training program offered by IDP-ICE UB: Training in citizen science: Introduction and deepening in the development of participatory research projects with social commitment. It had a 10 h duration and it was oriented to a wide audience that mostly include universities staff, civil society organisations representatives, university students, and public administration staff. Infographics created under the CSNOW project with the Citizen Science Work Group of the IDP-ICE UB, coordinated by Josep Perelló with the support of Núria Coll-Bonfill. Translations from Catalan to English have been possible with the support of the TORCH EU project. Design: Minimal Heroes.