The blueprints you make go in your inventory by default because that's the temporary storage area for them. (Incidentally, to get rid of a blueprint in your inventory, right click it and then click on the trashcan icon in the blueprint dialog which appears).
If you want your blueprints to be more permanent and persist between games you can put them in to the "My Blueprints" section of the blueprints screen.
There you can also organize your blueprints in to books of related blueprints.
For more detailed tutorials on how to use blueprints, try searching on youtube for: factorio blueprints
The blueprints you make go in your inventory by default because that's the temporary storage area for them. (Incidentally, to get rid of a blueprint in your inventory, right click it and then click on the trashcan icon in the blueprint dialog which appears).
If you want your blueprints to be more permanent and persist between games you can put them in to the "My Blueprints" section of the blueprints screen.
There you can also organize your blueprints in to books of related blueprints.
For more detailed tutorials on how to use blueprints, try searching on youtube for: factorio blueprints