SSD Caching, how its done, right choice?

Hello,

someone needed VPS with SSD caching, he want to use server for websites hosting. What does that mean, this SSD caching and is it optimal solution for this? Also i listen some SSD dont like too much of writting so how one can recognise certain SSD is made the way that its not destroyed soon by writting data (i mean when one have webserver, it is non stopping writting and erasing of data and server need to run like 2 yers...?

I assume that your client was talking about bcache or something similar.