FOSTER Plus, a two-year EU-funded project focused on supporting and contributing to a cultural shift towards open science in the European research community, has developed a collection of ten free online courses to "answer some of the most common questions you might have about putting open science into practice." Each course centers on a different aspect of open science, which FOSTER notes "applies to all research disciplines" and defines it as "the movement to make scientific research, data, and dissemination accessible to all levels of an inquiring society." Topics include managing and sharing research data, open-source software and workflows, and data protection and ethics. The courses can be taken in any order, but all learners should begin with What Is Open Science? as an introduction. Each course takes about one to two hours to complete, and learners can also earn badges for successful completion with free registration, though an account is not necessary to access the courses. This toolkit is primarily intended for early-career researchers, academic staff (such as librarians and IT technicians), and policymakers. The FOSTER Plus project will be continuing until the end of 2019 and is conducted by eleven project partners in six European countries.