The *best* way is to see what forces are acting on the joint and then
use methods which best transfer those forces away from the joint.
If there are no forces, then they can be simply positioned next to each
other with no securing needed.
At the other extreme, the joint can be encased in a welded steel splint..
Intermediate methods use a wooden joint, such as a half-lap or mortise
and tenon, to give a large surface area for glue to bond the two pieces
together. This can be further re-inforced with screws, nails, dowels,
biscuits, staples or a combination.
There are other, more complex wooden joints that again seek to maximise
glue area and to transfer the load along the grain and not across it.
Or, if "best" is quickest - then you can hammer tie plates (steel plates
with tens of small nail-shaped pieces formed on one surface) on either
side of the joint - very quick and often used in a roof carcass but this
will only transfer forces in the plane of the joint though and won't
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