Really interesting article including a tip about always eating tacos in Mexico with your hands. Using a knife and fork is considered snooty.
And hard tacos in Mexico?
No such thing. Flour but typically corn tortillas either served on a plate (sometimes encased in a plastic bag especially at a street taco stand) or served build your own style with various filings, condiments and a tortilla warmer full of hot and tasty tortillas is common!