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My understanding is that lighter roasts can actually have more caffeine than dark roasts because the roasting process gradually removes caffeine from the beans. That’s from George Howell who is kind of a coffee legend here in the US north east. Haven’t tested this myself.

This is what everyone at Starbucks is taught.

The way in which the beans are ground and the coffee brewed has a vastly larger impact on how caffeinated the drink will be.

French press could hurt your stomach more than a method that uses a paper filter.

my advice: avoid caffeine altogether, everything decaf, if you insist on consuming those beverages.