Here's the question you clicked on:
lindisfarne
How do I start
go to http://ocw.mit.edu/courses/mathematics/18-01sc-single-variable-calculus-fall-2010/index.htm read the "syllabus" http://ocw.mit.edu/courses/mathematics/18-01sc-single-variable-calculus-fall-2010/syllabus
Just pick a topic you find interesting so learning would be faster and dynamic :)