Or a textbook writer. Seriously, if you need a decent breakdown of "Learning X" into steps, then it's useful to look at the table of contents of a related text

Or a textbook writer. Seriously, if you need a decent breakdown of "Learning X" into steps, then it's useful to look at the table of contents of a related textbook even if you'd be learning from other sources (experimentation, documentation, whatever) because the split and order of topics will be at least somewhat reasonable.