Journalist's Toolbox, from the Society of Professional Journalists, is a site that provides a wealth of resources (many of which are free) for up-and-comers as well as professionals in the field.
Browse topics or beats from the home page to find examples of and tools for coverage in that area. Topics with recent updates include State/Local Government, COVID-19 Vaccines, and Mental Health for Journalists.
Visit their YouTube channel for Training Videos on mobile reporting apps, finding datasets, fact-checking, covering complex topics such as the environment, and more.
Visit their Journalism Jobs section for a variety of career resources and toolkits.