Simple quick change blades (with half a cut), such as:
Ryobi multi tool comes with the following blades:
These are extremely simple to use. See 2:45 in the above video (or see this).
However, other types of blades readily fit, as well, such as starlock, etc.
To fit these you first do the quick change step and release the front holder. Then with your hand unscrew it and fit the other blades. Then lock it up.
NAIL EATING BLADES
The one I’ve got is Diablo Steel Demon DIAZ 20AT Starlock, made in Switzerland. It is supposed to have 30x’s longer life in metal. Suitable for “metal demolition”. It works on hardened metal, stainless steel, fibre glass and fibre cement. With tungsten carbide teeth.
It is suitable to cut nails and screws, etc. And of course will cut plasterboard.