I have to renew my VCP for Fev 2019. Usually, I am just reaching for the last Mastering vSphere 6.x, but this time, it isn't release yet.. (only for 6.7 in Nov).
Which document/books/video would you recommend to prepare for VCP-DCV 6.5 ?
The product documentation and especially the "what's new" blogs/articles are probably going to be the most helpful for you. I found they were for me.