Access stopped being the hard part a while ago. Courses, lectures, manuals and whole textbooks are a search away, which means the bottleneck moved from finding material to staying with it after week two, when the novelty wears off and it starts to feel like work. The scarce thing now is a willingness to be bored and continue anyway.

Choose one free course and finish it rather than starting four. Put the sessions in the same slot each week so they do not need deciding about. Tell one person you are doing it, because a little accountability carries you through the dull middle.