*Video after the jump*
In my opinion, Xolette is one of the most informative knife throwing content providers on Youtube. I watched her videos for the better part of a year before I came across her target creation series and was inspired to start throwing knives again.
For anyone who doesn’t know what end grain targets are, end grain is the end of a block of wood. The side of wood has grain (the long lines of the wood) running up and down or left to right in most wood one can buy. The problem with these types of grain for throwing knives is that depending on how the blade is turned, it can be difficult to sink the throw. Knives also destroy these targets faster (because knives hit against the grain).
End grain targets last longer and allow knives to sink in easier. There is really no downside to this style of target other than the work involved (for people who are not lucky enough to just use the more traditional log rounds).
I highly suggest giving Xolette’s video series and the video linked in particul a look. I was able to make my target by cutting up fence posts and mounting everything together with 2x4s after using a good amount of wood glue between the individual blocks.