2 ms·

You can search and take a course in Coursera.org for example.

• alltakendamned 6y ago
  That's a good point, though there's currently more that 600 courses there for "sales". So we immediately get into the territory of not knowing what you don't know, or not seeing the forest through the trees - depending on what you like. I'm trying to answer the question on what needs to be learned first. I honestly don't know.