May technical questions

1) Is it good to you save your models and worksheets? the workbooks from money or the different programs offered important to just see them or is it meant to go back to? Once we do the sheet work is the work done? or is it recommended to review look or study those materials…

I would like to know Brooks thought on the way she feels its best to use the materials she designed..

2) in the beginners call the coach mentioned a 5 dollar app which she uses to do the work on and save the workbooks onto her iPad I have looked for apps and not figured out an easy way to save and edit the pdfs can you help with the name or how to write on the pdfs?