Please share with us any training courses which you recommend.
Open Learn (Open University have a course on the American Civil Rights Movement – great for those seeking a context for the Black Lives Matter movement and to learn about the campaign in the 50s and 60s for racial equality.
Future Learn have a course on the History of Slavery in the British Caribbean
Whites For Racial Equity is an American organisation with a good range of free online courses
See also the list of organisations here, many of which offer training packages.