As always there are many different ways to do this in Drupal - and the right way depends on the context but usually anything to do with classification should be suggesting taxonomys.
In Drupal content types are best used when the actual content is different - from your description it sounds rather like the content will be similar - but I do find your question confusing.
So, if your content has the same fields needs to be classified into a category you'll use one content type with at least a new term reference field that you will create to hold the reference to the taxonomy vocabulary. This one content type will hold all of the content related to movies, books and articles.
If your content will contain different fields then you'll need a content type for each of movies, books and articles.
You will need to setup views for each of the taxonomy - as this is a good way to get a block that you can put onto the sidebar. Remember that block contents can be dynamic but blocks cannot (easily) take parameters so the dynamicness of the content needs to be driven by something else.
Sections aren't something that I've used - I've generally found it much better to understand and use the taxonomy - especially seeing as all too often it is necessary to have one content in two taxonomy vocabularies.
Setting up a view for each taxonomy vocabulary will give blocks. Views is great and needs to be understood.
You can setup a view for a taxonomy (block & page) - I generally use panels to build specific pages presentations using a view of a taxonomy vocabulary (e.g. this one) which links through to the taxonomy term which is a page using a path (/taxonomy/term/%) with a grid view.
