Start with this: https://www.scilab.org/content/download/849/7901/file/Scilab...

Then read this: http://www.earth.northwestern.edu/people/seth/Educational/Sc...

Then read this: http://scilab.io/wp-content/uploads/2016/01/Numerical_Analys...

Then both : a. https://www.math.ust.hk/~machas/numerical-methods.pdf b. https://www.scilab.in/textbook_companion/generate_book/1332

Please do the exercises