Learn To Knit will walk you through the steps to start knitting. From casting on to casting off and all stages in between, with explanations on how to do all things knitting including join seams, make buttonholes and knit cables.
There is also a quiz that you can take for fun to see how much you have learned.
The Notepad section allows you to keep notes of things like needle sizes etc. to use as a shopping list when you try out the easy patterns included in the app.
Good luck and happy knitting!