Connecting a water heater, what kind of fittings, valves, and adapters?
Assuming that your HWT connections are 3/4 MIP and starting from the tank working back the the pipe at the wall:

Cold Side


3/4 FIP x 3/4 MIP Flex Hose





3/4 Threaded Ball Valve





7/8 x 3/4 Brass Compression x MPT Adapter




Hot Side


3/4 FIP x 3/4 FIP Flex Hose





7/8 x 3/4 Brass Compression x MPT Adapter




(No need for valve as the valve on the cold will isolate the hot)

No need to use these particular brands, they are just the first ones I found. All items should be available on Amazon or a local hardware store.