-Raw is perfectly fine for most veggies.
-Steaming is an easy method, if raw is unpleasant or if the veggie is more woody.
-Blanche and shock make a cooked veggie divine!
-Sauteed (with plenty of butter) until fork tender on the stove top also helps.
-Baking on a sheet tray, covered in olive oil and salt / pepper make a lot of veggies shine

The main issue with all of those is understanding cook times, which takes trial and error.