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I'm sure tester will jump in but I'd also buy some cutting fluid
You don't need coolant for hand tapping, you need lubrication. An old fashioned high sulphur cutting oil works well on steel, there are specialist products for hand tapping aluminium which do even better at preventing edge build up.
https://anchorlube.com/
https://www.tapmagic.com/product/2/tap-magic-aluminum
http://tapfree.com/alumtap.html
gbj_tester
@hugo7
You don't need to go crazy.
Imo the sets are good because you have everything in one neat place plus they come with the thread measurer thingy. If you're doing a lot in a couple of sizes then you can buy more bling taps/die, but the wrench and die holder are not rocket science.
I'm sure tester will jump in but I'd also buy some cutting fluid while you're at it. You can however diy this putting oil and water in bottle, then shake before use.