microbit.org
Of course, the Micro:bit site has a wealth of educational resources to get started. On our lessons page, you can sort resources by educational topic or programming language that are Curriculum-linked units of work for planning and teaching computing in primary and secondary schools (England KS2 and KS3).
support.microbit.org
Our support site is looked after by Foundation staff, providing dedicated email support to teachers, students and developers. Reach out to us by opening a ticket.
Microsoft Makecode
The makecode site also contains a wide range of resources including a 14 week introduction to Computer Science. Microsoft also have a UK Digital Skills Programme, a UK STEM eduction site and US Digital Skills Resource site
Awesome micro:bit
Awesome micro:bit is a carefully curated list of micro:bit related resources including an ever-expanding section on teaching resources. It's hosted on Github, an online code repository.
CAS
The Computing At School Forums are a walled-garden community aimed at teachers and other educators in the UK. There is a simple sign-up process here, which is free, to become a member. You have to provide some form of independently verifiable means that you are a teacher or an educator, in order to become a member. Searching for 'microbit' or 'micro:bit' within the forum posts brings up results.