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If you need to use certain information from a project in another (family types, annotation symbols, building types, materials...) you can do so by simply going to the Manage Tab of the Ribbon, and then choosing the "Transfer Project Standards" button (see below).
Once you've clicked this you will get the menu where you can choose which element do you really want to import and from which project (in case you have ore than one project open). you need to have both projects open, the one you want import from and the one you want to import to. The operation must be done being on a view of the project you want to import to.
It is no doubt a much better way than copying and pasting elements. Ideally, you want to have a very thorough template so you don't need to do this, but sometimes, to create this template (at least your first Revit template) you might want to use this process to import families, and other standards to it from projects you worked on to later polish them in the template file.
Hope this helps