Standard Drupal comes with a "promote to front page" when creating new content. But I want know how to promote, let's say
News flow to the block located to the right?
As far as I know there is no "url" for blocks so I can't really use view to assign my news flow to the blocks url. So how do I do this the easiest way?
I complete the previous answer about Drupal 8.
In Drupal 8 with Views (include in core) it's exactly the same way.
Add a 'Promote to block' checkbox field on your
News content type.
Then in Views you can create a new View or you can go in the "Content" View. Then create a new "Block". Describing all Views functionalities would take a long time, but in this block you can filter all your content, particularly in the Filter Criteria sections where you can filter in order to take only News content type with only the 'Promote to block' option checked.
If needed, search for some Views tutorials. It's quite easy and very powerful.
Then call this new block instead the old one.
Just use the Views module to create a block display. And within the block settings specify that you only want to show it on the "front page". The fields to be shown are probably only the title of the nodes you want to see included in that block. with that you've reduced your question (challenge) to selecting the appropriate Views "filter" and "sorting".
To filter your nodes, you could add an extra field to the content types (like your "News"?) you want to see included, whereas that field is just a boolean to yes/no indicate if it should be shown in that block.
If you'd want to make it a little more flexible (dynamic), you could also use the Flag module, and allow authorized users (with appropriate roles to set such flags) to flag whatever should be included in that block. Your view would then become a similar list of nodes that were "flagged".
Enough options to pick from?
PS 1: I'm assuming this question is about Drupal 7 ...
PS 2: for D8, Views is in core ... and for Flag there is a 8.x-4.x-dev release, for which the current status is "Under active development, but not yet ready for production."