Stopping client seeing cached webpage
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Ive found this tricky to word so please bear with me.

When I'm updating a website and I ask the client to see the changes, they always see the cached result from last time. Now this isn't a problem as I can ask them to ctrl f5 to refresh all the cache. 

My question is, is there a way that I can force the client browser to refresh all of the content automatically? and what is the usual standard on this? I want to still use cache as this speeds up the website, just be able to tell it when it has updated.

I know for javascript files and css files you can change the name of the file so the browser treats it as a new file and re-downloads it e.g. myCssFilev1.2.css but what about the actual HTML?