how could I concatenate 3 views in one page ?
Should I use blocks ?
how could I concatenate 3 views in one page ?
Should I use blocks ?
It probably depends on your layout. if you want to embed a view in somewhere else besides your block regions, you could try the embed views module I also believe the the panels module has a much more dynamic way of rendering multiple views on the page (but flexibility also adds some to the complexity)
You can use blocks, but Views provides an attachment display as well. Attachment displays can be attached other other displays within the view. So, you could create your base view, then create an attachment display that attaches to the base view, and then create a second attachment display which attaches to the first attachment display.
Attachment displays are good if each view is really just another way to view the same query (like, a summary view and a detail view). But if you wanted to combine three disparate views, blocks would be the way to go. Either create a block display for each view and add them to the same region in Site Building -> Blocks, or create a page display for one of the views and block displays for the other two.
A third option would be to use View Reference, which lets you reference views as CCK fields, if you needed the views to part of a node.