Looking for a good Robotics Curriculum

I’m part of a local freeCodeCamp group and we are looking for a good robotics curriculum. We want to set up a series of robotics classes for all ages. Several other coding groups are going to partner with us. We just started the planning phase and are looking for good - and preferably free - learning material for groups. We can get sponsors to buy things like raspberry pi’s or arduino’s as needed.
Thanks.