This guide is designed to provide information about online resources and materials that can be used to develop or refresh knowledge relevant to FCDO’s climate and environment technical competencies. It is not an exhaustive list and further resources may be added. The guide briefly explains what each resource is, what it covers, and an estimate of how long it takes to read/complete (where information is available). The courses and resources are mostly aimed at people with a general level of knowledge about climate and the environment. Particularly useful resources have been highlighted with *Key Report* at the top of the tables in sections 3, 4, and 5.