Open online courses or 'MOOC's from known providers. NB: check the respective platforms to confirm current availability of these courses, which may require payment for longer-term access.
FutureLearn: courses free to enter, pay to upgrade to permanent access. NB: courses may not always be currently available; check website for details. The following are a selection from a wide range listed on the FutureLearn website (search: Covid-19 for further options).