We would like to go to the Holten Canadian War Cemetery from Delft, was is the best way to get there?
With the train it's a long journey, involving at least two changes: www.ns.nl/en/journeyplanner/#/ I'm not sure whether you'll be able to get a taxi from the railway station in Holten to the cemetery. Otherwise it looks like a 30-minute walk.
It would be a lot easier with a car. The cemetery's website gives instructions: www.cwgc.org/find-a-cemetery/cemetery/2020600/HOLTEN%20CANADIAN%20WAR%20CEMETERY
Edit. Whether train or car, it's easily combined with a visit to Deventer, a nice historical city on the IJssel.