Yes, to setting a goal - you only need to have one, some people like to have more. You work on it through the year and you can write a post each week if you want to, or you can just report your progress in the comments in the weekly savings post. Some people find the weekly post helpful (and it brings some rewards), others do a monthly post (often with HPUD), or a quarterly review. It's very flexible so you can choose what works for you.