This doesn't address the different types of veggies, but the other guideline I like is to "eat a rainbow" every day. That doesn't pertain solely to veggies, but to fruits and veggie together. I've seen the breakdown a few different ways, but the one I'm most familiar with is:
White: Cauliflower, onions, garlic, mushrooms, potatoes, etc.
Yellow/orange: Oranges, squash, pumpkin, sweet potatoes, carrots, etc.
Red/purple: Berries, cherries, red cabbage, tomatoes, beets, apples (not sure they should be there, but they usually are), eggplant, etc.
Blue: Blueberries (I think there's something else, but it's not coming right now.
Green: Broccoli, peas, beans, kale, spinach, lettuce (all other leafy greens), avocado, cucumber, etc.
This way of thinking is very, very loose, and you could eat a far from supercharged diet...but it at least ensures that people are taking in a variety of fruits and veggies, yk? I think it's a pretty simple way to at least try to get enough veggies. From there, you can work on ramping up your choices and looking at what veggies contain what nutrients.
I eat a ton of other stuff, including some really junky things, but I hit most of the rainbow every day...sometimes hitting many in one dish (eg. a bunch of kale sauteed with garlic, onion & tomato).