I'd like to have some folders on top e.g. on Windows I had _videos folder which would always appear on top. How do I achieve the same effect in case of Nautilus? It's rarely the case I'd need similar for files but if you know how to do it it also for some files, please drop your hint.
Bookmarks can be added to the left panel in the Nautilus menu in Bookmarks > Add Bookmark or just pressing Ctrl+D when inside a folder
If you still want to sort out the folders so that a few are kept always on top you can do so manually by going to View > Arrange Items > Manually, they will keep the desired order.
If you still want to organize by name so that some folders are kept always on top of the order just add a
If you are trying to access your folders as fast as possible another option would be the creation of a quicklist for the Unity launcher, instructions can be found here